2D	- 2-Dimensional
3ACC	- 3A Central Control
3D	- 3-Dimensional
3M	- Minnesota Mining and Manufacturing
4GL	- Fourth Generation Language
4H	- Head, Heart, Hands, Health
5XBCOER	- 5 X-Bar Central Office Equipment Reports system, "5XB COER"
A	- Aftermath
AA	- Administrative Assistant
AA	- Affirmative Action committee
AA	- Alcoholics Anonymous
AA	- American Airlines
AA	- Antiaircraft Artillery
AA	- Associate in Accounting
AA	- Astronomy and Astrophysics, "A&A"
AA	- Automobile Association (in England)
AAA	- American Automobile Association
AAA	- Anti-Aircraft Artillery
AAAAAA	- Association for the Abolition of Abused Abbreviations and Asinine Acronyms
AAAL	- American Academy of Arts and Letters
AAAS	- American Association for the Advancement of Science
AAII	- American Association of Individual Investors
AAMSI	- American Association for Medical Systems Informatics
AAO	- Anglo-Australian Observatory
AAP	- Affirmative Action Program
AARC	- Anglo-American Cataloging Rules
AARP	- Appletalk ARP
AAS	- American Astronomical Society
AAVSO	- American Association of Variable Star Observers
AAX	- Automated Attendant eXchange
AB	- Able Bodied seaman
ABA	- American Bar Association
ABA	- American Basketball Association
ABA	- American Booksellers Association
ABATS	- Automatic Bit Access Test System
ABBR	- ABBReviation
ABC	- American Broadcasting Company
ABEL	- Advanced Boolean Expression Language (a Data-I/O Trademark)
ABHC	- Average Busy Hour Calls
ABI	- American Bell Inc
ABI	- Application Binary Interface (SunOS and SV application sw interface std)
ABM	- Asynchronous Balanced Mode
ABS	- Acrylonitrile Butadiene-Styrene (plastic)
ABS	- Alternative Billing Service
ABS	- American Bureau of Shipping
ABSBH	- Average Busy Season Busy Hour
AC	- Access Control
AC	- Adaptive Control
AC	- Alternating Current (ac, see also DC)
AC	- Answer Center (Sun)
AC	- Ante Christum (before Christ)
AC	- Ante Cibum (before meals)
ACAA	- Agricultural Conservation and Adjustment Administration
ACAWS	- Advisory, Caution, And Warning System
ACB	- Annoyance Call Bureau
ACBL	- American Contract Bridge League
ACC	- Argonne Code Center
ACC	- Audio Communications Controller
ACCRA	- American Chamber of Commerce Research Association
ACCS	- Army Command and Control System
ACCS	- Automated Calling Card Service
ACCT	- Account
ACD	- Automatic Call Distributor [telephony]
ACDA	- Automatic Call Disposition Analyzer
ACE	- Advanced Composition Explorer
ACE	- Advanced Computing Environments [Corporate name]
ACE	- Automatic Calibration and Equalization
ACE	- Automatic Calling Equipment
ACF	- Advanced Communications Functions
ACH	- Attempt per Circuit per Hour
ACHEFT	- Automated ClearingHouse Electronic Funds Transfer
ACK	- ACKnowledge
ACK	- Amsterdam Compiler Kit
ACL	- Access Control List
ACL	- Advanced Cmos Logic
ACLU	- American Civil Liberties Union
ACM	- Access Control Machine
ACM	- Association for Computing Machinery
ACO	- Acronym Control Officer
ACOF	- Attendant Control Of Facilities
ACP	- ACtion Point
ACRNEMA	- a medical imaging standard, "ACR/NEMA"
ACRV	- Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle
ACS	- Advanced Communications System
ACS	- Australian Computer Science
ACSE	- Association Control Service Entity (ISO/CCITT layer 7)
ACSNET	- Acedemic Computing Services NETwork
ACSU	- Advanced t-1 Channel Service Unit
ACTPU	- ACTivate Physical Unit (SNA)
ACTS	- Advanced Communications Technology Satellite
ACTS	- Automated Coin Toll Service
ACTS	- Automatic Coin Telephone Service  [telephony]
ACTUP	- AIDS Coalition To Unleash Power, "ACT UP"
ACU	- Alarm Control Unit
ACU	- Automatic Calling Unit
ACW	- Alternating Continuous Waves
ACWP	- Actual Cost of Work Performed
AD	- Addendum
AD	- After Date
AD	- Analog to Digital converter, "A/D" (see ADC)
AD	- Anno Domini (in the year of our Lord)
AD	- Application Development
ADA	- Air Defense Artillery
ADB	- A DeBugger
ADB	- Apple Desktop Bus
ADC	- Analog to Digital Converter
ADCCP	- Advanced Data Communications Control Procedure
ADCI	- Automatic Display Call Indicator
ADD	- Advanced Dungeons & Dragons, "AD&D"
ADDCP	- Advanced Data Communication Control Procedure
ADEW	- Andrew Development Environment Workbench
ADF	- Automatic Direction Finder
ADFRF	- Ames-Dryden Flight Research Facility (was DFRF) (NASA)
ADI	- Anolog Device Inc
ADM	- ADMiral
ADM	- Additional Dealer Markup
ADM	- Advanced Micro Devices
ADMD	- Administration Management Domain
ADN	- Abbreviated Dialing Number
ADP	- Adenosine Di-Phosphate
ADP	- Administrative Data Processing
ADP	- Advanced Data Processing
ADP	- Automatic Data Processing
ADPCM	- Pulse Code Modulation with Adaptive Quantization
ADS	- Advanced Digital System
ADS	- Application Development System
ADS	- Audio Distribution System
ADS	- Automatic Voice System
ADS	- Auxilary Data System
ADSP	- AppleTalk Data Stream Protocol
ADSR	- Attack Decay Sustain Release
ADT	- Abstract Data Type
ADT	- Atlantic Daylight Time
AE	- Application Entity/Environment/Execution/Engineering (APE)
AEA	- American Electronics Association
AEA	- Atomic Energy Authority
AEC	- Architectural Engineering Construction
AEC	- Atomic Energy Commission
AEF	- American Expeditionary Force (see BEF)
AEGIS	- Advanced Electronic Guidance and Instrumentation System
AES	- Application Environment Specification
AF	- Address Family (sockets)
AF	- Adventures in Fantasy
AF	- Air Force
AF	- Audio Frequency
AFACTS	- Automatic FACilities Test System
AFADS	- Automatic Force Adjustment Data System
AFATDS	- Advanced Field Artillery Tactical Data System
AFB	- Air Force Base
AFC	- American Football Conference
AFC	- Automatic Frequency/Flight Control
AFCAC	- Air Force Computer Acquisition Center
AFCC	- Air Force Communications Command
AFGE	- American Federation of Government Employees
AFI	- Authority and Format Identifier
AFIPS	- American Federation of Information Processing Societies
AFL	- American Federation of Labor
AFL	- American Football League
AFLCIO	- American Federation of Labor; Congress of Industrial Organizations, "AFL-CIO"
AFM	- Adobe Font Metrics
AFNOR	- Association Francaise de NORmalization
AFP	- Appletalk Filing Protocol
AFS	- Air Force Station
AFS	- Andrew File System
AFSC	- Air Force Systems Command
AFSCME	- American Federation of State, County and Municipal Employees
AFSK	- Automatic Frequency Shift Keying
AFTRA	- American Federation of Television and Radio Artists
AFUU	- Association Francaise des Utilisateurs d'Unix
AG	- Adjutant General
AG	- Arcade Game
AG	- Attorney General
AGCT	- Army General Classification Test
AGL	- Above Ground Level
AGM	- Air-to-Ground Missile
AGN	- Active Galactic Nucleus
AGU	- American Geophysical Union
AH	- Artificial Horizon
AH	- Avalon Hill (major war game manufacturer)
AHA	- American Homebrew Association
AHL	- American Hockey League
AHQ	- Air HeadQuarters
AI	- Allegheny International
AI	- Amnesty International
AI	- Anal Intrusion
AI	- Artificial Insemination
AI	- Artificial Intelligence
AI	- Attitude Indicator
AIA	- American Institute of Architects
AIA	- Application Integration Architecture
AIAA	- American Institute of Aeronautics and Astronautics
AIC	- Automatic Intercept Center
AICC	- Automatic Intercept Communications Controller
AID	- Agency for International Development
AIDDE	- Ames' Interactive Dynamic Display Editor
AIDS	- Acquired ImmunoDeficiency Syndrome
AIM	- Air Interception Missile
AIM	- Airman's Information Manual
AIMS	- Advanced Inventory Management System
AIOD	- Automatic Identification Outward Dialing 
AIPS	- Astronomical Image Processing System
AIS	- Action Item System
AIS	- Automatic Intercept System
AIX	- Advanced Interactive eXecutive (unix)
AJ	- Astronomical Journal
AK	- Alaska
AKA	- Also Known As
AL	- Alabama
AL	- American League (baseball)
ALA	- American Library Association
ALA	- Automobile Legal Association
ALAP	- AppleTalk-LocalTalk Link Access Protocol
ALBM	- Air-to-Land Ballistic Missile
ALBO	- Automatic Line BuildOut
ALC	- Automatic Load Control
ALEXIS	- Array of Low Energy X-ray Imaging Sensors
ALFA	- Anonima Lombarda Fabbrica Automobili
ALFE	- Analog Line Front End
ALGOL	- ALGOrithmic Language
ALI	- Automatic Location Indentification
ALIT	- Automatic Line Insulation Testing
ALM	- Asychronous Line Module
ALM	- Asynchronous Line Multiplexer
ALPO	- Association of Lunar and Planetary Observers
ALRU	- Automatic Line Record Update
ALS	- Advanced Launch System [Space]
ALS	- Automated List Service
ALU	- Arithmetic Logic Unit
AM	- Administrative Module
AM	- Agricultural and Mechanical, "A&M"
AM	- Air Marshal
AM	- Alpes-Maritimes, "A.-M."
AM	- American, "Am."
AM	- Americium, "Am"
AM	- Amplitude Modulation
AM	- Ante Meridiem, "a.m." (before noon)
AM	- anno mundi (in the year of the world)
AMA	- American Medical Association
AMA	- Association for Model Aviation
AMA	- Automatic Message Accounting
AMACS	- Automatic Message Accounting Collection System
AMARC	- Automatic Message Accounting Recording Center
AMASE	- Automatic Message Accounting Standard Entry
AMAT	- Automatic Message Accounting Transmitter
AMATPS	- Automatic Message Accounting TeleProcessing System
AMBA	- Association of Master of Business Administration
AMC	- Albany Medical College
AMD	- Advanced Micro Devices [Corporate name]
AMERITECH	- AMERican Information TECHnologies
AMEX	- AMerican EXpress
AMI	- American Micro System Inc
AMORC	- Ancient Mystic Order Rosae Crucis
AMP	- Adenosine MonoPhosphate
AMPAS	- Academy of Motion Picture Arts and Sciences
AMPS	- Advanced Mobile Phone Service
AMRAAM	- Advanced Medium Range Air-To-Air Missile
AMROC	- American Rocket Company [Space]
AMSAT	- radio AMateur SATellite corp.
AMT	- Active Memory Technology
AMU	- Atomic Mass Unit
AMVET	- AMerican VETeran
AN	- Associated Number
ANA	- American Nurses Association
ANA	- Automatic Number Announcement
ANAC	- Automatic Number Announcement Circuit [telephony]
ANC	- All Number Calling [telephony]
ANC	- American Network Communications
ANC	- Army Nurse Corps
ANDF	- Architecture-Neutral Distribution Format
ANF	- Automatic Number Forwarding 
ANG	- Air National Guard
ANI	- Automatic Number Identification [telephony]
ANIF	- Automatic Number Identification Failure
ANL	- Argonne National Laboratory
ANOVA	- ANalysis Of VAriance
ANPA	- American Newspaper Publishers Association
ANSI	- American National Standards Institute
ANU	- Australian National University
ANZUS	- Australia, New Zealand, United States
AO	- Account Of
AOA	- Abort Once Around (Shuttle abort plan)
AOCS	- Attitude and Orbit Control System
AOL	- Absent Over Leave (see AWOL)
AOP	- Annual Operating Plan
AOPA	- Aircraft Owners and Pilots Association
AOQ	- Average Outgoing Quality
AOS	- Academic Operating System
AOS	- Alternate Operator Service [telephony]
AOSS	- Auxilliary Operator Service System
AOW	- Asia and Oceania Workshop
AP	- Accounts Payable, "A/P"
AP	- Additional Premium
AP	- All Points
AP	- Application Process
AP	- Associated Press
AP	- Attached Processor
APA	- All Points Addressable
APB	- All Points Bulletin
APC	- AMARC Protocol Converter
APDA	- Apple Programmers and Developers Association
APDU	- Application Protocol Data Unit
APE	- APplication Engineering
APG	- Aberdeen Proving Ground
API	- American Petroleum Institute
API	- Application Program Interface
API	- Application Programming Interface
APICS	- American Production and Inventory Control Society
APJ	- Astrophysical Journal, "Ap.J", "ApJ"
APL	- A Programming Language
APM	- Attached Pressurized Module (a.k.a. Columbus)
APO	- Alpha Phi Omega, service fraternity
APO	- Army Post Office
APP	- Application Portability Profile
APPC	- Advanced Peer-to-Peer Communications
APPC	- Advanced Program-to-Program Communication (IBM)
APR	- Annual Percentage Rate
APS	- Automatic Protection Switch
APSE	- Ada Programming Support Environment
APU	- Auxiliary Power Unit
AQ	- Accumulator-Quotient register
AQL	- Acceptable Quality Level
AR	- Accounts Receivable, "A/R"
AR	- Address Register
AR	- Alarm Report
AR	- Arkansas
ARAMIS	- American Rheumatic Arthritis Medical Information System
ARC	- American Red Cross
ARC	- Ames Research Center (NASA)
ARC	- Audio Response Controller
ARCNET	- Attached Resource Computer local area NETwork
ARCO	- Atlantic Richfield COmpany
ARIS	- Audichron Recorded Information System
ARM	- Acorn Risc Machine
ARM	- Adjustable Rate Mortgage
ARM	- Annotated Reference Manual
ARO	- After Receipt of Order
ARP	- Address Resolution Protocol (Internet->Ethernet)
ARPA	- Advanced Research Projects Agency (of the DoD, see DARPA)
ARPANET	- Advanced Research Projects Agency NETwork
ARQ	- Automatic Repeat reQuest
ARRL	- Amateur Radio Relay League
ARS	- Alternate Route Selection
ARSA	- Airport Radar Service Area
ARSB	- Automated Repair Service Bureau
ARTCC	- Air Route Traffic Control Center
ARTEMIS	- Advanced Relay TEchnology MISsion
ARU	- Audio Response Unit
ARV	- American Revised Version
AS	- Anglo-Saxon
ASA	- Acetyl Salicylic Acid
ASA	- American Standards Association (now ANSI)
ASA	- Astronomical Society of the Atlantic
ASAIGAC	- As Soon As I Get A Chance
ASAP	- As Soon As Possible
ASC	- Accredited Standards Committee
ASC	- Additional Sense Code
ASCAP	- American Society of Composers, Authors, and Publishers
ASCC	- Automatic Sequence-Controlled Calculator
ASCII	- American Standard Code for Information Interchange
ASCQ	- Additional Sense Code Qualifier
ASDIC	- Anti-Submarine Detection Investigation Committee (British for sonar)
ASDSP	- Application-Specific Digital Signal Processor
ASG	- Automated Sciences Group
ASHRAE	- Amer. Soc. of Heating, Refrigerating and Air-cond. Engineers, inc.
ASI	- Agenzia Spaziale Italiano
ASI	- Asynchronous SCSI Interface
ASI	- Automatic System Installation
ASIC	- Application Specific Integrated Circuit
ASK	- Amplitude Shift Keying
ASM	- American Society of Metals
ASME	- American Society of Mechanical Engineers
ASN	- Abstract Syntax Notation
ASN1	- Abstract Syntax Notation One, "ASN.1"
ASOC	- Administrative Service Oversight Center
ASP	- Aggregated Switch Procurement
ASP	- Appletalk Session Protocol
ASPCA	- American Society for the Prevention of Cruelty to Animals
ASPCC	- American Society for the Prevention of Cruelty to Children
ASPEN	- Automatic System for Performance Evaluation of the Network
ASR	- Airport Surveillance Radar
ASRM	- Advanced Solid Rocket Motor
ASRS	- Aviation Safety Reporting System
ASSR	- Autonomous Soviet Socialist Republic
AST	- Applied System Technology
AST	- Asyncronous System Trap
AST	- Atlantic Standard Time
ASTM	- American Society of Testing and Materials
ASV	- American Standard Version
AT	- Access Tandem
AT	- Atlantic Time
ATA	- AT Attachment
ATA	- Airport Traffic Area
ATA	- Automatic Trouble Analysis
ATACC	- Advanced Tactical Air Command Central
ATB	- Advanced Technology Bomber (stealth bomber)
ATB	- All Trunks Busy
ATC	- Air Traffic Control
ATC	- Atsugi Technical Center
ATC	- Automatic Transmission Control
ATDRS	- Advanced Tracking and Data Relay Satellite
ATE	- Automatic Test Equipment
ATF	- Advanced Technology Fighter
ATH	- Abbreviated Trouble History
ATI	- Automatic Test Inhibit
ATIS	- Atherton Tools Interface Specification
ATIS	- Automatic Terminal Information Service
ATIS	- Automatic Transmitter Identification System
ATK	- Andrew ToolKit
ATLAS	- Atmospheric Laboratory for Applications and Science
ATM	- Adobe Type Manager
ATM	- Amateur Telescope Maker
ATM	- Automatic Teller Machine
ATM     - Asynchronous Transfer Mode
ATMS	- Automated Trunk Measurement System
ATN	- Automated Test Network
ATO	- Abort To Orbit (Shuttle abort plan)
ATOMS	- AT&t Optimized Materials Simulator
ATP	- Adenosine TriPhosphate
ATP	- Airline Transport Pilot (highest grade of pilot certificate)
ATP	- All Tests Pass
ATP	- Appletalk Transaction Protocol
ATP2	- AppleTalk Phase 2
ATPCO	- Airline Tariff Publishing COmpany
ATR	- Alternate Trunk Routing
ATRS	- Automated Trouble Reporting System
ATS	- Automated Test System
ATT	- American Telephone & Telegraph, "AT&T"
ATTC	- Automatic Transmission Test and Control circuit
ATTCOM	- American Telephone & Telegraph COMmunications
ATTIS	- American Telephone & Telegraph Information Systems
ATV	- All Terrain Vehicle
AU	- Arithematic Unit
AU	- Astronomical Unit (93,000,000 miles) [Space]
AUDIX	- AUDio Information eXchange
AUI	- Attachment Unit Interface
AUP	- Acceptable Use Policy
AUP	- Advanced Undergraduate Project
AURA	- Association of Universities for Research in Astronomy
AUS	- Army of the United States
AUTODIN	- AUTOmatic DIgital Network
AUTOSEVCOM	- AUTOmatic SEcure Voice COMmunications
AUTOVON	- AUTOmatic VOice Network
AUX	- Apple UniX
AUXF	- AUXillary Frame
AV	- AudioVisual
AVD	- Alternate Voice Data
AVLIS	- Atomic Vapor Laser Isotope Separation
AWACS	- Airborne Warnings And Control Systems
AWEA	- American Wind Energy Association
AWG	- American Wire Gauge
AWK	- al Aho, peter Weinberger, brian Kernighan (pattern scanning language)
AWOL	- Absent WithOut Leave (also Absent Without Official Leave) (see AOL)
AWST	- Aviation Week and Space Technology (a.k.a. AvLeak), "AW&ST"
AXAF	- Advanced X-ray Astrophysics Facility [Space]
AY	- Arther Young
AZ	- Arizona
B	- Book
B	- Byte
B	- bit, "b"
B6ZS	- Bipolar with 6 Zero Subsitution
B911	- Basic 911
BA	- Bachelor of Arts
BACH	- Business Alliance for Commerce in Hemp
BAFO	- Best And Final Offer
BALUN	- BALanced to UNbalanced
BAMAF	- BELLCORE AMA Format
BANCS	- Bell Administrative Network Communications System
BAPCO	- Bellsouth Advertising & Publishing COmpany
BARRNET	- Bay Area Regional Research Network, "BARRNet" (SF Bay Area)
BASH	- Bourne-Again SHell
BASIC	- Beginner's All-purpose Symbolic Instruction Code
BATSE	- Burst And Transient Source Experiment (on GRO)
BB	- Ball Bearing
BB	- Bases on Balls
BB	- Best of Breed
BB	- Bunnies and Burrows
BBA	- Bachelor of Business Administration
BBB	- Better Business Bureau
BBC	- British Broadcasting Corporation
BBL	- Barrel
BBN	- Bolt, Beranek, and Newman [Corporate name]
BBS	- Bulletin Board Service
BBXRT	- Broad-Band X-Ray Telescope (ASTRO package)
BC	- Battlecars
BC	- Before Christ
BC	- British Columbia
BCBS	- Blue Cross/Blue Shield, "BC/BS"
BCC	- Blind/Blank Carbon Copy
BCC	- Blocked Call Cleared
BCC     - Block Check Character
BCCI	- Bank of Credit and Commerce International
BCD	- Bad Conduct Discharge
BCD	- Binary Coded Decimal
BCD	- Blocked Call Delayed
BCDIC	- Binary Coded Decimal Interchange Code
BCE	- Before the Common Era (substitute for BC)
BCP	- Binary Communications Protocol
BCP	- Byte Controlled Protocols
BCPL	- Basic Combined Programming Language
BCR	- Bell Communications Research
BCS	- Bachelor of Commercial Science
BCS	- Batch Change Supplement
BCS	- Binary Compatibility Standard (ABI for Motorola chips)
BCS	- Boston Computer Society
BCS	- British Computer Society
BCS     - Basic Combined Subset
BCWP	- Budgeted Cost of Work Performed
BCWS	- Budgeted Cost of Work Scheduled
BD	- Bachelor of Divinity
BD	- Bank Draft
BD	- Bills Discounted
BDA	- Battle Damage Assessment
BDA	- Bomb Damage Assessment
BDC	- Boston Development Center
BDD	- Basic Dungeons & Dragons, "BD&D"
BDF	- Binary Distribution Format
BDF	- Bitmap Description Format (Adobe)
BDF	- Bitmap Distribution Format
BDT	- Billing Data Transmitter
BDT	- Bulk Data Transfer
BE	- Back End
BE	- Bill of Exchange
BEA	- Bureau of Economic Analysis
BEAV	- Binary Editor And Viewer
BECAUSE	- BEnchmark of Concurrent Architectures for their Use in Scientific Engineering
BED	- Hanscom Field, Bedford MA
BEF	- Band Elimination Filter
BEF	- British Expeditionary Force (see AEF)
BELLCORE	- BELL COmmunications REsearch
BEM	- Bug Eyed Monster
BENELUX	- BElgium, NEtherlands, and LUXembourg
BER	- Basic Encoding Rules
BER	- Bit Error Rate
BERT	- Bit Error Rate Test
BEST	- Borland Enhanced Support and Training
BETRS	- Basic Exchange Telecommunications Radio Service
BF	- Brought Forward
BFA	- Bachelor of Fine Arts
BFD	- Big F***ing Deal
BFHD	- Big Fat Hairy Deal
BFR	- Biennial Flight Review
BGP	- Border Gateway Protocol
BH	- Black Hole
BH	- Boot Hill
BHA	- Butylated HydroxyAnisole
BHC	- Busy Hour Calls
BHP	- Brake HorsePower
BHT	- Butylated HydroxyToluene
BI	- Backplane Interconnect
BI	- Bus Interconnect
BICS	- Building Industry Consulting Services [telephony]
BID	- Bis In Die (twice a day)
BIMA	- Berkeley Illinois Maryland Array
BIND	- Berkeley Internet Name Daemon
BIOC	- Break Into Other Computers
BIOS	- Basic Input Output System
BIS	- Business Information System
BISDN   - Broadband Integrated Services Digital Network, "B-ISDN"
BISP	- Business Information System Program
BISYNC	- Binary Synchronous Communications, "BiSync" (BSC is preferred) [IBM]
BIT	- Binary digIT
BIT	- Bipolar Integrated Technology Inc
BITNET	- Because-It's-Time NETwork
BITS	- Biotechnology Information Toolkit Software
BIU	- Bus Interface Unit
BIX	- Byte Information eXchange
BL	- Bill of Loading
BLAS	- Basic Linear Algebra Subroutines
BLAST	- BLocked ASynchronous Transmission
BLDS	- Busy Line/Don't Answer, "BL/DS"
BLER	- Block Error Rate
BLERT	- BLock Error Rate Test
BLF	- Busy Lamp Field [telephony]
BLF	- Busy Line Field
BLM	- Bureau of Land Management
BLOBS	- Binary Large OBjectS
BLS	- Bureau of Labor Statistics
BLS	- Business Listing Service
BLT	- BLock Transfer
BLT	- Bacon, Lettuce, and Tomato
BLV	- Busy Line Verification
BM	- Basal Metabolism
BM	- Bowel Movement
BM	- Breakdown Maintenance
BMA	- Bank Marketing Association
BMEWS	- Ballistic Missile Early Warning
BMG	- Bloomington, IN
BMI	- Broadcast Music Inc.
BMO	- Ballistic Missile Office
BMOC	- Big Man On Campus
BMP	- Benchmark Plan
BMR	- Basal Metabolism Rate
BMW	- Bavarian Motor Works/Bayerische MotorenWerke [Corporate name]
BNC	- Bayonet Navy Connector
BNC	- Bayonet Neill Concelman (connector) [electronics] (see also TNC)
BNC	- Berkley Nucleonics Corporation
BNC	- British Naval Connectors
BNET	- Berkeley NETworking
BNF	- Bachus-Naur Form
BNFL	- British Nuclear Fuels Ltd
BNRCVUUCP	- Batch News ReCeive Via UUCP
BNS	- Billed Number Screening
BNSC	- British National Space Centre
BNU	- Basic Networking Utilities (AT&T's name for HoneyDanBer UUCP)
BO	- Body Odor
BO	- Branch Office
BO	- Buyer's Option
BOC	- Bell Operating Company
BOD	- Board Of Directors
BOF	- Birds Of a Feather
BOM	- Bill Of Materials
BOQ	- Bachelor Officers' Quarters
BOR	- Basic Output Report
BORSCHT	- Battery, Overvoltage, Ringing, Supervision, Coding, Hybrid Test
BOS	- Boston MA
BOS	- Business Office Supervisor
BOSIX	- Biin Open System Interface eXtension
BOSS	- Billing and Order Support System
BOT	- Beginning Of Tape
BP	- Blood Pressure
BP	- British Petroleum
BP	- British Pharmacopoeia
BPI	- Bits Per Inch, Blocks Per Inch, Bytes Per Inch
BPOC	- Bell Point Of Contact
BPOE	- Benevolent and Protective Order of Elks
BPPS	- Basing-Point Pricing System
BPS	- Bits/Bytes Per Second
BPSS	- Basic Packet-Switching Service
BR	- Bills Receivable
BR	- British Rail
BRAT	- Business Residence Account Tracking system
BRC	- Business Reply Card
BRCS	- Business Residence Custom Service
BRI	- Basic Rate Interface
BRIEF	- Basic Reconfigurable Interactive Editing Facility
BRL	- Ballistics Research Lab
BRL	- army Ballistic Research Laboratory
BRM	- Basic Remote Module
BRS	- Bibliographic Retrieval Service
BS	- Bachelor of Science
BS	- Back Space
BS	- Banded Signaling
BS	- Bill of Sale
BS	- Bill of Sale, "B/S"
BS	- British Standards
BSA	- Basic Serving Arrangements
BSA	- Birmingham Small Arms
BSA	- Boy Scouts of America
BSBH	- Busy Season Busy Hour
BSC	- Bachelor of SCience, "BSc"
BSC	- Binary Synchronous Communication
BSC	- Binary Synchronous Communications (also sometimes BiSync) [IBM]
BSC	- Business Service Center
BSCM	- BiSynchronous Communications Module
BSD	- Berkeley Software Distribution
BSE	- Basic Service Element
BSF	- Bell Shock Force
BSI	- British Standards Institute
BSMTP	- Batched SMTP
BSN	- Bachelor of Science in Nursing
BSOC	- Bell Systems Operating Company
BSP	- Bell System Practice
BSRFS	- Bell System Reference Frequency Standard
BSS	- Basic Synchronized Subset
BSS	- Block Started by Symbol (IBM assembly-language)
BST	- Basic Services Terminal
BSTJ	- Bell System Technical Journal
BSW	- Boston Software Works
BT	- Bus Terminator
BTAM	- Basic Telecommunications Access Method [IBM]
BTHU	- British Thermal Unit, "BThU" (BTU, q.v., is preferred)
BTL	- Backplane Transceiver Logic
BTL	- Bell Telephone Laboratories
BTN	- Billing Telephone Number
BTO	- Bachman Turner Overdrive
BTOL	- Better Than Open Look
BTS	- Board Tracking System
BTU	- British Thermal Unit
BTW	- By The Way [net jargon]
BU	- Bushido
BU	- Business Units
BURP	- Brewers United for Real Potables
BUS	- Basic Utility System
BUT	- Board Under Test
BV	- Blessed Virgin
BVA	- Billing Validation Application
BVC	- Billing Validation Center
BVY	- Beverly MA
BW	- Business Wire
BWC	- BandWidth Compression
BWI	- Baltimore-Washington International (airport)
BWI	- British West Indies
BWM	- Broadcast Warning Message
BWT	- Broadcast Warning TWX
BWTS	- BandWidth Test Set
BX	- Base eXchange (see also PX)
BYU	- Brigham Young University
C	- Copper
C	- programming language, successor to BCPL
CA	- CAble
CA	- California
CA	- Chartered Accountant
CA	- Chief Accountant
CA	- Chronological Age
CA	- Collision Avoidance (as in CSMA/CA (q.v.))
CAA	- Civil Aviation Authority (U.K.)
CAB	- Civil Aeronautics Board
CABS	- Carrier Access Billing System
CAC	- Calling-card Authorization Center
CAC	- Carrier Access Code
CAC	- Circuit Administration Center
CAC	- Customer Administration Center
CACM	- Communications of the Association for Computing Machinery
CAD	- Computer Aided Design (sometimes seen as CAD/CAM)
CAD	- Computer-Aided Dispatch
CADD	- Computer-Aided Design and Drafting
CADV	- Combined Alternate Data/Voice
CAE	- Common Application Environment
CAE	- Computer-Aided Education
CAE	- Computer-Aided Engineering
CAES	- Center for Advanced Engineering Studies [MIT]
CAFE	- Corporate Average Fuel Economy
CAGR	- Compound Annual Growth Rate
CAI	- Call Assembly Index
CAI	- Computer Aided Instruction
CAI	- Computer Application Inc
CAI	- Computer Assisted Instruction
CAIS	- Colocated Automatic Intercept System
CAIS	- Common Apse Interface Specification
CALRS	- Centralized Automatic Loop Reporting System
CALS	- Computer-aided Acquisition and Logistics Support
CAM	- Common Access Method (SCSI)
CAM	- Computer Aided Management
CAM	- Computer Aided Manufacturing (sometimes seen as CAD/CAM)
CAM	- Computer-Aided Manufacturing
CAM	- Content Addressable Memory
CAMA	- Centralized Automatic Message Accounting
CAMAC	- Computer Automated Measurement And Control
CAMM	- Computer Assisted Material Management
CAMP	- Campaign Against Marijuana Planting
CAMRA	- CAMpaign for Real Ale
CAN	- Campus Area Network
CAP	- Civil Air Patrol
CAP	- Columbia Appletalk Package
CAP	- Computer Aided Publishing
CAPP	- Computer Aided Process Planning
CAPTAIN	- Character And Pattern Telephone Access Information Network
CAR	- Computer Access & Retrieval
CAR	- Contents of the Address part of the Register
CAROT	- Centralized Automatic Reporting On Trunks
CART	- Championship Auto Racing Teams
CAS	- Circuit Associated Signaling
CAS	- Communicating Application Specification
CAS	- Computerized Autodial System
CASE	- Common Application Service Element
CASE	- Computer Aided Software Engineering
CASSIS	- Classification and Search Support Information System
CAT	- Computer Assisted Typesetter
CAT	- Computer-Aided Tomography
CAT	- Craft Access Terminal
CAT	- Customer Acceptance Test
CAT	- conCATenate
CATIS	- Common Applications and Tools Integration Services
CATLAS	- Centralized Automatic Trouble Locating and Analysis System
CATV	- Community Antenna TeleVision
CAU	- Connection Arrangement Unit
CAV	- Constant Angular Velocity
CAVU	- Ceiling And Visibility Unlimited
CB	- Citizens Band radio
CBC	- Canadian Broadcasting Corporation
CBD	- Cash Before Delivery
CBD	- Central Business District
CBD	- Commerce Business Daily
CBDS    - Connectionless Broadband Data Service
CBEMA	- Computer & Business Equipment Manufacturers Association
CBI	- Computer Based Instruction
CBR	- Chemical, Biological, Radiological warfare
CBS	- Columbia Broadcasting System
CBS	- CrossBar Switching
CBW	- Chemical and Biological Warfare
CBX	- Computerized Branch eXchange
CC	- Carbon Copy
CC	- Center Conductor
CC	- Central Control
CC	- Common Control
CC	- Cost Center
CC	- Country Code
CC      - C Compiler
CC      - Cluster Controller
CCA	- Computer Corporation of America [Corporate name]
CCAFS	- Cape Canaveral Air Force Station
CCC	- Canadian Committee on Cataloging
CCC	- Central Control Complex
CCC	- Ceramic Chip Carriers
CCC	- Civil(ian) Conservation Corps
CCC	- Command, Control, and Communications (sometimes C^3)
CCC	- Computer Control Center
CCC	- Concourse Computer Center [MIT]
CCCCM	- CCC CounterMeasures (sometimes C^3CM)
CCCI	- Command, Control, Communications, and Intelligence
CCD	- Charge Coupled Device (see CID)
CCD	- Computer-Controlled Display
CCDS	- Centers for the Commercial Development of Space
CCH	- Connections per Circuit per Hour
CCI	- Computer Carrier Interrupt
CCI	- Computer Consoles, Incorporated
CCIM	- Certified Commercial Investment Member
CCIP	- Continuously Computed Impact Point
CCIR	- Comite' Consultatif International des Radio Communications
CCIS	- Common Channel Interoffice Signaling [telephony]
CCITT	- Comite' Consultatif International Telegraphique et Telephonique
CCITT	- International Consultative Committee for Telegraphy and Telephony
CCL	- Console Command Language
CCNC	- Common Channel Network Controller
CCNC	- Computer/Communications Network Center
CCR	- Commitment, Concurrency, and Recovery
CCR	- Covenants, Conditions, and Restrictions
CCR	- Creedence Clearwater Revival
CCR	- Customer-Controlled Reconfiguration
CCRP	- Continuously Computed Release Point
CCS	- Common Channel Signaling
CCS	- Common Command Set (SCSI)
CCS	- Hundred (C) Call Seconds
CCSA	- Common Control Switching Arrangement [telephony]
CCT	- Central Control Terminal
CCTA	- Central Computer and Telecommunications Agency
CCTAC	- Computer Communications Trouble Analysis Center
CCTV	- Closed Circuit TeleVision
CCU	- COLT Computer Unit
CCV	- Calling Card Validation
CCW	- Counter ClockWise
CD	- Carrier Detect (properly DCD (q.v.))
CD	- Certificate of Deposit
CD	- Change Directory
CD	- Civil Defense
CD	- Collision Detection (as in CSMA/CD (q.v.))
CD	- Compact Disk
CDA	- Call Data Accumulator
CDA	- Coin Detection and Announcement
CDA	- Compound Documents Architecture
CDAR	- Customer Dialed Account Recording
CDB	- Command Descriptor Block
CDB	- Customer Distributed Buglist
CDC	- Centers for Disease Control
CDC	- Control Data Corporation, inc. [Corporate name]
CDCF	- Cumulative Discounted Cash Flow
CDEV	- Control panel DEVice
CDF	- Combined Distributing Frame
CDF	- Context-Dependent File
CDI	- Circle Digit Identification
CDI	- Course Deviation Indicator
CDIAC	- Carbon Dioxide Information Analysis Center
CDO	- Community Dial Office
CDP	- Career Development Program
CDPR	- Customer Dial Pulse Receiver
CDR	- Call Dial Rerouting
CDR	- CommanDeR
CDR	- Contents of the Decrement part of the Register
CDR	- Critical Design Review
CDROM	- Compact Disk Read Only Memory, "CD-ROM"
CDS	- Craft Dispatch System
CDSF	- Commercially Developed Space Facility
CDT	- Call Data Transmitter
CDT	- Central Daylight Time
CDU	- Control Display Unit
CE	- Chemical Engineer
CE	- Civil Engineer
CE	- Common Era (substitute for AD)
CE	- Corps of Engineers
CE	- Customer Engineer
CEA	- Commissariat a l'Energie Atomique, France
CEA	- Council of Economic Advisors
CEA	- County Education Authority
CEC	- Commission of the European Communities
CED	- Committee for Economic Development
CEERT	- Coalition for Energy Efficiency and Renewable Technologies
CEF	- Cable Entrance Facility
CEI	- Comparably Efficient Interconnection
CELSS	- Controlled Ecological Life Support System [Space]
CEN	- Centre d'Etudes Nucleaires
CENS	- Centre d'Etudes Nucleaires de Seclay
CENTO	- CENtral Treaty Organization
CEO	- Chief Executive Officer
CERMET	- Ceramic Metal Element
CERN	- organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires
CERT	- Computer Emergency Response Team
CET	- Central European Time
CEV	- Controlled Environment Vault
CEVI	- Common Equipment Voltage Indicator
CF	- Carry Forward
CF	- Coin First payphone [telephony]
CFA	- Center For Astrophysics
CFA	- Communaute Financiere Africaine (consortium of economically linked African countries)
CFB	- Color Frame Buffer
CFC	- Chloro-FluoroCarbon [chemical]
CFC	- Combined Federal Campaign
CFCA	- Communications Fraud Control Association
CFD	- Computational Fluid Dynamics
CFF	- Columbus Free Flyer
CFHT	- Canada-France-Hawaii Telescope
CFI	- Certificated Flight Instructor
CFI	- Cost, Freight, and Insurance
CFL	- Canadian Football League
CFO	- Chief Financial Officer
CFP	- Call For Papers
CFR	- Code of Federal Regulations
CG	- Coast Guard
CG	- Commanding General
CGA	- Color Graphics Adapter
CGCT	- Compagnie Generale de Constructions Telephoniques
CGE	- Cincinnati Gas & Electric, "CG&E"
CGE	- Compagnie Generale d'Electricite
CGI	- Computer Graphics Interface
CGIAR	- Consultative Group on International Agricultural Research
CGM	- Computer Graphics Metafile
CGN	- Concentrator Group Number
CGS	- Centimeter-Gram-Second
CGX	- Chicago (Meigs) IL
CH	- Cardboard Heroes
CH	- ClearingHouse
CH	- CourtHouse
CH	- Customs House
CHA	- Champions
CHAP	- CHAnnel Processor
CHARA	- Center for High Angular Resolution Astronomy
CHARGEN	- CHARacter GENerator
CHI	- Chill:  Adventures into the Unknown
CHOTS	- Corporate Headquarters Office Technology System
CHP	- California Highway Patrol
CI	- Cubic Inches
CIA	- Central Intelligence Agency [US Government]
CIAC	- Computer Incident Advisory Capability
CIB	- Console Interface Board
CIC	- Carrier Identification Code
CIC	- Coordination and Information Center [CSNet]
CICA	- Competition in Contracting Act
CICS	- Customer Information Control System [IBM]
CICSVS	- Customer Information Control System / Virtual Storage, "CICS/VS"
CID	- Central Institute for the Deaf
CID	- Charge Injection Device (see CCD)
CID	- Computer Integrated Design
CIDIN	- Common Icao Data Interchange Network
CIF	- Caltech Intermediate Form
CIF	- Cost, Insurance and Freight
CII	- Call Identity Index
CIM	- Computer Integrated Manufacturing
CIMA	- Construction Industry Manufacture's Association
CINC	- Commander in Chief
CIO	- Chief Information Officer
CIP	- Chief Income Producer
CIRCA	- Center for Instructional and Research Computing Activities
CIRRIS	- Cryogenic InfraRed Radiance Instrument for Shuttle
CIS	- Chief Income Spender
CIS	- Commonwealth of Independent States
CIS	- Compuserve Information S?
CIS	- Customized Intercept Service
CISC	- Complex Instruction Set Computer
CIT	- California Institute of Technology
CIT	- Case Institute of Technology (part of CWRU, Cleveland, OH)
CIT	- Circumstellar Imaging Telescope [Space]
CIT	- Computer Integrated Telephony
CIU	- Computer Interface Unit
CL	- Connection-Less mode
CLASP	- Comprehensive Logistics Automated Support Program
CLASS	- Centralized Local Area Selective Signaling
CLASS	- Custom Local Area Signaling Service
CLDN	- Calling Line Directory Number
CLEF	- Certified Licensed Evaluation Facility
CLEI	- Common-Language Equipment Identification
CLI	- Calling Line Ident
CLI	- Command Line Interpreter
CLID	- Calling Line IDentification
CLLI	- Common-Language Location Identification
CLNP	- ConnectionLess Network Protocol
CLOS	- Common Lisp Object System
CLR	- Combined Line and Recording
CLRC	- Circuit Layout Record Card
CLS     - connectionless server
CLTP	- Connectionless Transport Protocol
CLU	- Chartered Life Underwriter
CLUT	- Color LookUp Table
CLV	- Constant Linear Velocity
CM	- Command Module (Apollo spacecraft)
CM	- Congregation of the Mission
CM	- Corrective Maintenance
CMA	- Cash Management Account
CMAC	- Centralized Maintenance and Administration Center
CMC	- Communication Machinery Corporation
CMC	- Construction Maintenance Center
CMC	- Corporate Management Commitee
CMCC	- Central Mission Control Centre (ESA)
CMD	- Centralized Message Distribution
CMDF	- Combined Main Distributing Frame
CMDS	- Centralized Message Data System
CMH	- Port Columbus OH
CMI	- Champaign-Urbana IL
CMIP	- Common Management Information Protocol
CMIS	- Common Management Information Service
CMISE	- Common Management Information Service Element
CML	- Current Model Logic
CMMU	- Cache/Memory Management Unit
CMOS	- Complimentary-symmetry Metal-Oxide Semiconductor
CMOT	- Common Management Information Services and Protocol over TCP/IP
CMRR	- Common Mode Rejection Ratio
CMS	- Call Management System
CMS	- Circuit Maintenance System
CMS	- Communications Management Subsystem
CMS	- Conversational Monitoring System
CMSGT	- Chief Master Sergeant, "CMSgt"
CMT	- Cellular Mobile Telephone
CMU	- COLT Measurement Unit
CMU	- Carnegie-Mellon University
CMW	- Compartmented Mode Workstation
CMYK	- Cyan, Magenta, Yellow, blacK
CN	- Canadian National (railroad) [Corporate name]
CN	- Change Notice
CNA	- Communications Network Application
CNA	- Customer Name / Address, "CN/A" [telephony]
CNA	- Customer Name and Address
CNAB	- Customer Name/Address Bureau
CNC	- Computer Numerical Control
CNCC	- Customer Network Control Center
CNES	- Centre National d'Etude Spatiales
CNI	- Common Network Interface
CNM	- Communications Network Management
CNMS	- Cylink Network Management System
CNN	- Cable News Network
CNO	- Carbon-Nitrogen-Oxygen
CNO	- Chief of Naval Operations
CNR	- Canadian National Railways
CNR	- Carrier to Noise Ratio
CNR	- Consiglio Nazionale delle Ricerche, Italy
CNRCVUUCP	- Compressed News ReCeive Via UUCP
CNS	- Central Nervous System
CNS	- Complimentary Network Service
CNSR	- Comet Nucleus Sample Return
CO	- Cash Order
CO	- Central Office [telephony]
CO	- Colorado
CO	- Commanding Officer
CO	- Conscientious Objector
CO	- in Care Of, "C/O"
COAM	- Customer Owned And Maintained
COB	- Close Of Business
COBE	- COsmic Background Explorer
COBOL	- COmmon Business Oriented Language
COC	- Call of Cthulhu
COC	- Circuit Order Control
COCOM	- Coordinating Comittee for Export to Comminist Area
COCOT	- Customer-Owned Coin-Operated Telephone [telephony]
COD	- Collect On Delivery; Cash On Delivery
CODASYL	- Conference On DAta SYstems Languages
CODCF	- Central Office Data Connecting Facility
CODEC	- COder-DECoder
COE	- Center Of Excellence
COE	- Central Office Equipment
COEES	- COE Engineering System
COER	- Central Office Equipment Report
COFF	- Common Object File Format
COLA	- Cost-Of-Living Allowance
COLT	- Central Office Line Tester
COM	- Commercial (pilot certificate)
COM	- Computer Output Microfilm
COMAS	- Central Office Maintenance and Administration System
COMDEX	- COMputer Dealer's Exposition
COMM	- Communications
COMPACT	- COMmercial Product ACquisition Team
COMPTEL	- COMPton TELescope (on GRO)
COMS	- Complementary Metal Oxide Semiconductor
COMSAT	- COMmunications SATellite [Space]
COMSAT	- Communications Satellite Corp
CONN	- CONNector
CONS	- Connection-Oriented Networking Session
CONTAC	- Central Office NeTwork ACcess
CONUS	- CONtinental United States
COO	- Chief Operating Officer
COP	- Character-Oriented Protocol
COPS	- Computer Oracle and Password System
COQ	- Cost Of Quality
CORE	- COntrolled Requirement Expression
CORN	- COmputer Resource Nucleus
CORNET	- CORperate NETwork
COS	- Central Office Switch
COS	- Corporation for Open Systems
COSINE	- Cooperation for Open Systems Interconnection Networking in Europe
COSMIC	- COmmon Systems Main InterConnection frame system
COSMIC	- COmputer Software Management and Information Center
COSMOS	- COmputer System for Mainframe OperationS
COSTAR	- Corrective Optics Space Telescope Axial Replacement
COT	- Central Office Terminal
COTS	- Connection-Oriented Transport (layer) Service
CP	- Canadian Pacific
CP	- Canadian Press
CP	- Chemically Pure
CP	- CoPy
CP	- Command Post
CP	- Command Processor
CP	- Control Program
CPA	- Certified Public Accountant
CPA	- Communications & Public Affairs, "C&PA"
CPC	- Cellular Phone Company
CPC	- Circuit Provisioning Center
CPD	- Central Pulse Distributor
CPE	- Customer Premises Equipment
CPE	- Customer-Provided Equipment
CPFF	- Cost Plus Fixed Fee
CPH	- Cost Per Hour
CPI	- Characters Per Inch
CPI	- Common Programming Interface
CPI	- Computer Private branch exchange Interface
CPIO	- CoPy In/Out
CPL	- Combined Programming Language
CPM	- Control Program for Microcomputers (sometimes CP/M)
CPM	- Cost Per Minute
CPM	- Critical Path Method
CPMP	- Carrier Performance Measurement Plan
CPO	- Chief Petty Officer
CPO	- Chief Post Office
CPO	- Customer Premises Equipment
CPP	- Cable Patch Panel
CPR	- Canadian Pacific Railway
CPR	- Cardio-Pulmonary Resuscitation
CPS	- Characters Per Second
CPSR	- Computer Professionals for Social Responsibility
CPT	- CaPTain
CPU	- Central Processing Unit
CPW	- Certified Public Weigher
CQ	- Charge of Quarters, Call to Quarter
CQ	- Commercial Quality
CR	- Carriage Return (ASCII 15 octal)
CRAF	- Comet Rendezvous/Asteroid Flyby [Space]
CRAM	- Card Random Access Memory
CRAS	- Cable Repair Administrative System
CRB	- Certified Residential Broker
CRC	- Camera Ready Copy
CRC	- Chemical Rubber Company
CRC	- Civil Rights Commission
CRC	- Customer Record Center
CRC	- Cyclic Redundancy Check
CRC	- Cyclical Redundancy Character
CRD	- Customer Required Date
CREG	- Concentrated Range Extension with Gain
CREN	- Corporation for Research and Educational Networking
CRFC	- Customer Return For Credit
CRFMP	- Cable Repair Force Management Plan
CRI	- Cray Research, Inc.
CRIN	- Centre de Recherche en Informatique de Nancy
CRIS	- Customer Record Information System
CRISP	- Complex-Reduced Instruction Set Processor
CRL	- Certificate Revocation List
CRLF	- Carriage Return/Line Feed
CRONIC	- Colorado Rudimentary Operating Nucleus for Intelligent Controllers (HSC OS)
CROTCH	- Computerized Routine for Observing and Testing the Channel Hardware
CRRES	- Combined Release / Radiation Effects Satellite
CRS	- Centralized Results System
CRSAB	- Centralized Repair Service Answering Bureau
CRT	- Cathode Ray Tube (also generic reference to a terminal)
CRTC	- Canadian Radio-television and Telecommunications Commission
CS	- Chivalry & Sorcery, "C&S"
CS	- Civil Servant
CS	- Computer Science; Computing Science
CS	- County Seat
CS	- Customer Service
CSA	- Canadian Standards Association
CSA	- Carrier Serving Area
CSA	- Client Service Agent
CSA	- Confederate States of America
CSA	- Customer Service Administration
CSAB	- Computing Sciences Accreditation Board
CSACC	- Customer Service Administration Control Center
CSACS	- Centralized Status, Alarm and Control System
CSAR	- Centralized System for Analysis Reporting
CSC	- Cell Site Controller
CSC	- Computer Sciences Corporation
CSD	- Customer Service Division
CSDC	- Circuit Switched Digital Capability
CSE	- Common Subexpression Elimination
CSF	- Critical Success Factor
CSI	- Commercial Systems Integration
CSIRO	- Commonwealth Scientific and Industrial Research Organization
CSIS	- Canadian Security and Intelligence Service
CSL	- Coin Supervising Link 
CSM	- Command Sergeant Major
CSM	- Command and Service Module (Apollo spacecraft)
CSMA	- Carrier Sense Multiple Access
CSMACA	- Carrier Sense Multiple Access with Collision Avoidance, "CSMA/CA"
CSMACD	- Carrier Sense Multiple Access with Collision Detection, "CSMA/CD"
CSN	- Computer Systems News (magazine)
CSNET	- Computer Science NETwork
CSO	- Central Services Organization
CSO	- Computing Services Office (UIUC)
CSOC	- Consolidated Space Operations Center (at Colorado Springs)
CSP	- Control Switching Point
CSPAN	- Cable-Satellite Public Affairs Network, "C-SPAN"
CSR	- Center for Space Research [MIT]
CSR	- Control and Status Register
CSRG	- Computer Systems Research Group
CSRI	- Computer Systems Research Institute (U Toronto)
CSRS	- Civil Service Retirement System
CSS	- Computer Sub-System
CSS	- Customer Switching System
CST	- Central Standard Time
CSTC	- Consolidated Satellite Test Center (USAF)
CSU	- Channel Service Unit
CT	- Central Time
CT	- Communications & Tracking, "C&T"
CT	- Computed Tomography
CT	- Connecticut
CTC	- Canadian Transport Commission
CTC	- Central Test Center
CTC	- Centralized Traffic Control [railroad]
CTC	- Chu-Itoh Techno-Science Co.
CTD	- Computing and Telecommunications Division
CTERM	- Command TERMinal (DECNET)
CTIO	- Cerro Tololo Inter-american Observatory
CTM	- Contac Trunk Module
CTMS	- Carrier Transmission Measuring System
CTNE	- Compania Telefonica Nacional de Espana
CTO	- Call Transfer Outside
CTP	- Center for Theoretical Physics [MIT]
CTS	- Carpal Tunnel Syndrome
CTS	- Cartridge Tape Subsystem (Exabyte)
CTS	- Clear To Send
CTS	- Compatible Timesharing System
CTSS	- {Compatible,Chameleon,Cray,Cyber} Time-Sharing System
CTT	- Cartridge Tape Transport
CTTC	- Cartridge Tape Transport Controller
CTTN	- Cable Trunk Ticket Number
CTV	- Canadian TeleVision network
CU	- Close-Up
CU	- Control Unit
CU	- Customer Unit
CUA	- Common User Access
CUCRIT	- Capital Utilization CRITeria
CUL	- See You Later [net jargon]
CUNBATCH	- Compressed news UNBATCH
CUTK	- Common Update/EQuipment system, "CU/TK"
CV	- Constant Velocity
CV	- Curriculum Vitae
CVCC	- Controlled Vortex Combustion Chamber
CVR	- Compass Voice Response
CVT	- Continuous Variable Transmission
CW	- Car Wars
CW	- Chemical Warfare
CW	- Child Welfare
CW	- Churchwarden
CW	- Continuous Wave
CWC	- City-Wide Centrex
CWI	- Centrum voor Wiskunde en Informatica (Centre for Mathematics and Computer Science)
CWO	- Cash With Order
CWO	- Chief Warrant Officer
CWRU	- Case Western Reserve University
CXI	- Common X-windows Interface
CY	- Calendar Year
CYO	- Catholic Youth Organization
CZ	- Canal Zone
CZ	- Control Zone
D	- Depth
DA	- Days after Acceptance
DA	- Department of Agriculture
DA	- Deposit Account
DA	- Desk Accessory (Mac)
DA	- Digital to Analog converter, "D?A"
DA	- Directory Assistance (/C = computerized, /M = Microfilm)
DA	- District Attorney
DA	- Don't Answer
DAC	- Design Automation Conference
DAC	- Digital to Analog Converter
DACCS	- Digital Access Cross Connect System [telephony]
DACS	- Digital Access Cross-connect System [telephony]
DACS	- Directory Assistance Charging System
DAD	- Draft ADdendum
DAIS	- Distributed Automatic Intercept System
DAMQAM	- Dynamically Adaptive Multicarrier Quadrature Amplitude Modulation
DAP	- Data Access Protocol (DECNET)
DAP	- Division Advisory Panel [of NSF (q.v.) DNCRI (q.v.)]
DAR	- Daughters of the American Revolution
DARC	- Division Alarm Recording Center
DARPA	- Defense Advanced Research Projects Agency
DARU	- Distributed automatic intercept system Audio Response Unit
DAS	- Directory Assistance System
DAS	- Distributor And Scanner
DASD	- Direct Access Storage Device
DASWDT	- Distributor And Scanner-Watch Dog Timer, "DAS-WDT"
DAT	- Digital Audio Tape
DATA	- Defense Air Transport Administration
DAV	- Data Above Voice
DAV	- Disabled American Veterans
DAY	- Dayton OH
DB	- DataBase
DB	- DeciBels, "db"
DB	- Dial Box
DBA	- Data Base Administrator
DBA	- Doing Business As
DBAC	- Data Base Administration Center
DBAS	- Data Base Administration System
DBF	- DBase Format
DBM	- DataBase Manager
DBME	- DataBase Managment Environment
DBMS	- DataBase Management System (rdbms for Relational)
DBRAD	- Data Base Relational Application Directory
DBS	- Duplex Bus Selector
DC	- Data Cartridge
DC	- Direct Current, "dc" (see also AC)
DC	- District of Columbia
DCA	- Defense Communications Agency
DCA	- Distributed Communication Architecture
DCA	- Document Content Architecture
DCA	- Washington (National) DC
DCC	- Data Country Code
DCC	- Descriptive Cataloging Committee
DCC	- Digital Compact Cassette
DCCO	- Defense Commercial Communications Office
DCCS	- DisContiguous Shared Segments
DCD	- Data Carrier Detect (sometimes CD (q.v.))
DCE	- Data Circuit-terminating Equipment
DCE	- Data Communications Equipment
DCE	- Distributed Computing Environment
DCH	- D Channel Handler
DCI	- Desktop Color Imaging
DCL	- DEC Control Language
DCL	- Digital Command Language
DCLU	- Digital Carrier Line Uint
DCM	- Digital Carrier Module
DCMS	- Distributed Call Measurement System
DCMU	- Digital Concentrator Measurement Unit
DCNA	- Data Communication Network Architecture
DCNS	- Distributed Computing and Network Services [MIT]
DCO	- Document Change Order
DCP	- Distributed Communications Processor
DCP	- Duplex Central Processor
DCPR	- Detailed Contuing Property Record (PICS/DCPR)
DCPSK	- Differential Coherent Phase-Shift Keying
DCS	- Digital Crosconnect System
DCS	- Distribution Control System
DCSB	- Dry Cooked Sliced Beef (Chinese dish)
DCT	- Digital Carrier Trunk
DCTN	- Defense Commercial Telecommunications Network
DCTS	- Dimension Custom Telephone Service
DD	- Daredevils
DD	- Data Dictionary
DD	- Days after Date
DD	- Demand Draft
DD	- Dishonorable Discharge
DD	- Disk Drive
DD	- Doctor of Divinity
DD	- Dungeons & Dragons, "D&D"
DDA	- Digital Differential Analyzer
DDA	- Domain Defined Attribute
DDB	- Device Dependent Bitmap
DDC	- Digital Data Converter
DDC	- Direct Department Calling
DDCMP	- Digital Data Communication Message Protocol
DDCU	- DC-to-DC Converter Unit
DDD	- Direct Distance Dialing [Telephony; principally US, elsewhere STD]
DDE	- Dynamic Data Exchange
DDJ	- Dr. Dobbs Journal
DDK	- Driver Development Kit (from MS)
DDL	- Document Description Language
DDN	- Defense Data Network
DDN	- Dun Dun Noodles (Chinese dish)
DDP	- Datagram Delivery Protocol
DDP	- Distributed Data Processing
DDPEX	- Device Dependent PEX
DDS	- Dataphone Digital Service [AT&T]
DDS	- Digital Data Service
DDS	- Digital Data Storage (Sony and HP's DAT format)
DDS	- Digital Data System
DDS	- Digital Dataphone Service
DDS	- Direct Digital Service
DDS	- Doctor of Dental Surgery; Doctor of Dental Science
DDS	- Document Distribution Services
DDS     - Dataphone Digital service  carrier offering 2.4 - 56 kb/s
DDT	- DicholoroDiphenylTricholoroethane
DDX	- Digital Data eXchange, Device Dependent X (windows)
DDX	- Distributed Data eXchange
DE	- Delaware
DE	- Disk Enclosure
DEA	- Data Encryption Algorithm
DEA	- Drug Enforcement Agency
DEAR	- Department of Energy Acquisition Regulation
DEBNA	- Digital Ethernet BI Network Adapter
DEC	- Digital Equipment Corporation [Corporate name]
DECUS	- Digital Equipment Computer Users Society
DELNI	- Digital Ethernet Local Network Interconnect
DELQA	- Digital Ethernet Lowpower Q-bus network Adapter
DELUA	- Digital Ethernet Lowpower Unibus network Adapter
DEMPR	- Digital Ethernet Multi-Port Repeater
DEPCA	- Digital Ethernet Personal Computer-bus Adapter
DEQNA	- Digital Ethernet Q-bus Network Adapter
DEREP	- Digital Ethernet REPeater
DERP	- Defective Equipment Replacement Program
DES	- Data Encryption Standard
DESPR	- Digital Ethernet Single Port Repeater
DESTA	- Digital Ethernet thin-wire STation Adapter
DEUNA	- Digital Ethernet Unibus Network Adapter
DEW	- Distant Early Warning (as in DEW Line)
DEXEC	- Diagnostic EXEc software
DF	- Damage Free
DF	- Direction Finding
DF	- Direction Finding, "D/F"
DFC	- Distinguished Flying Cross
DFD	- Data Flow Diagram
DFE	- Data Flow Editor
DFI	- Digital Facility Interface
DFM	- Distinguished Flying Medal
DFMS	- Digital Facility Management System
DFRF	- Dryden Flight Research Facility (now ADFRF)
DFS	- Depth-First Search
DFS	- Distributed File System
DFT	- Discrete Fourier Transform
DFW	- Dallas-Ft.Worth (regional airport)
DG	- Data General [Corporate name]
DG	- Dei Gratia (by the grace of God)
DG	- Directional Gyro
DG	- Director General
DGA	- Direct Graphics Access
DGP	- Dissimilar Gateway Protocol
DGSC	- Defense General Supply Center
DHHS	- Department of Health and Human Services
DHSS	- Department of Health and Social Security (British)
DHSS	- british Department of Health and Social Security
DIA	- Defence Intelligence Agency
DIA	- Document Interchange Architecture
DIAD	- (magnetic) Drum Information Assembler / Dispatcher
DIAL	- Direct Information Access Line
DIAS	- Defense Automatic Integrated System
DIB	- Device Independent Bitmap
DIB	- Directory Information Bases
DIC	- Digital Interface Controller
DID	- Direct Inward Dialing [telephony]
DIF	- Digital Interface Frame
DIF	- Document Interchange Format
DIFMOS	- Double Injection Floating Gate MOS
DIL	- Dual InLine
DILOG	- DIstributed LOGic
DIM	- Data In the Middle
DIMS	- Document Image Management System
DIN	- Deutsche Industrie Normenausschuss
DIN	- Deutsches Institut fur Normung
DINK	- Double Income, No Kids
DIP	- Dual Inline Package
DIPB	- Distributed Information Processing Board
DIR	- Deliverly & Installation Request
DIRE	- Dire Is Really Emacs
DIRT	- Design In Real-Time
DIS	- Draft International Standard (ISO)
DISA	- Direct Inward System Access
DISOSS	- DIStributed Office Support System
DIU	- Digital Interface Unit
DIV	- Division
DIX	- DEC, Intel, Xerox (Ethernet hardware levels)
DIY	- Do It Yourself
DJ	- Disc Jockey
DLA	- Defense Logistics Agency
DLC	- Data Link Control
DLC	- Digital Loop Carrier
DLC	- Driver's License Compact (Uniform interstate treatment)
DLCU	- Digital Line Carrier Unit
DLE     - Data Link Escape
DLG	- Digital Line Graph
DLI	- Data Link Interface
DLL	- Dial Long Lines
DLL	- Dynamic Link Library
DLO	- Dead Letter Office
DLS	- Data Link Control
DLS	- Digital Link Service
DLTU	- Digital Line/Trunk Unit
DLUPG	- Digital Line Unit-Pair Gain, "DLU-PG"
DM	- Delta Modulation
DM	- Dialog Manager
DM	- District Manager
DM	- Dungeon Master
DMA	- Direct Memory Access
DMD	- Directory Management Domain
DMD	- Doctor of Dental Medicine
DME	- Distance Measuring Equipment
DMI	- Digital Multiplexed Interface
DML	- Data Manipulation Logic
DMOS	- Diffusion Metal Oxide Semiconductor (see MOS)
DMS	- Data Management System
DMS	- Digital Multiplexed System
DMS	- Diskless Management Services
DMSP	- Defense Meteorological Satellite Program
DMU	- Data Manipulation Unit
DMV	- Department of Motor Vehicles
DMZ	- DeMilitarized Zone
DN	- Directory Number
DNA	- DeoxyriboNucleic Acid
DNA	- Digital Network Architecture [DEC]
DNC	- Direct Numerical Control
DNC	- Dynamic Network Controller
DNCRI	- [NSF (q.v.)] Division of Networking and Communications Research and Infrastructure
DNHR	- Dynamic NonHierarchical Routing
DNI	- DECnet Network Interface
DNIC	- Data Network Identification Code [telephony]
DNL	- Director of Naval Laboratories
DNR	- Dialed Number Recorder [telephony]
DNS	- Domain Name System
DNX	- Dynamic Network X-connect
DOA	- Dead On Arrival
DOB	- Date Of Birth
DOC	- Dynamic Overload Control
DOCS	- Display Operator Console System
DOD	- Department Of Defense [U.S. Government]
DOD	- Department of Defense, "DoD"
DOE	- Department Of Energy [U.S. Government]
DOE	- Depends On Experience
DOHC	- Dual OverHead Camshaft
DOJ	- Department Of Justice [U.S. Government]
DOM	- Data On Master group
DOMAIN	- Distributed Operating Multi Access Interactive Network (Apollo)
DORE	- Dynamic Object Rendering Environment
DOS	- Disk Operating System
DOT	- Department Of Transportation [U.S. Government]
DOTE	- Director, Operational Test and Evaluation, "DOT&E"
DOTS	- Digital Office Timing Supply
DOV	- Data Over Voice [telephony]
DOW	- Day Of Week
DP	- Data Processing
DP	- Demarcation Point
DP	- Dial Pulse [telephony]
DP	- Displaced Persons (expelled from native land)
DP	- Display Postscript
DP	- Double Play
DP	- Draft Proposal
DPA	- Delegation of Procurement Authority
DPAC	- Dedicated Plant Assignment Center
DPANS	- Draft Proposed American National Standard
DPC	- Destination Point Code
DPE	- Data Path Extender
DPI	- Dots Per Inch
DPM	- Defect Per Million
DPM	- Digital Panel Meter
DPM	- Directional Policy Matrix
DPMI	- DOS Protected Mode Interface
DPNPH	- Data Packet Network-Packet Handler, "DPN-PH"
DPP	- Discounted Payback Period
DPS	- Display PostScript
DPSK	- Differential Phased-Shift Keying
DQ	- Dairy Queen
DQ	- Dragon Quest
DQDB    - Distributed Queue Dual Bus a reservation-strategy MAN 150 Mb/s
DQL	- Database Query Language
DR	- Data Ready
DR	- Data Receive
DR	- Dead Reckoning
DR	- Dining Room
DRAM	- Dynamic Random Access Memory (as opposed to static RAM)
DRD	- Data Reading Device
DRE	- Directional Reservation Equipment
DRG	- Democratic Republic of Germany (East Germany)
DRI	- Defense Research Internet (replaces Arpanet)
DRI	- Digital Research, Incorporated [Corporate name]
DRMU	- Digital Remote Measurement Unit
DRP	- DECnet Routing Protocol
DRS	- Data Rate Select (RS-232)
DS	- Digital Signal
DS	- Digital carrier Span
DS	- Direct Signal
DS	- Directory Service
DS	- Double-Sided
DSA	- Dial System Assistance
DSA	- Digital Storage Architecture
DSA	- Directory Service Agent
DSAB	- Distributed Systems Architecture Board
DSBAM	- Double-SideBand Amplitude Module
DSC	- Document Structuring Conventions
DSCS	- Defense Satellite Communications System
DSD	- Data Structure Diagram
DSDC	- Direct Service Dial Capability
DSE	- Data Structure Editor
DSEE	- Domain Software Engineering Environment
DSI	- Digital Speech Interpolation
DSM	- Distinguished Service Medal
DSN	- Deep Space Network
DSN	- Digital Signal (level) N
DSO	- Digital Storage Oscilloscope
DSO	- Distinguished Service Order
DSP	- Decessit Sine Prole (died without issue)
DSP	- Defense Support Program (USAF/NRO)
DSP	- Digital Signal Processor; Digital Signal Processing
DSP	- Domain-Specific System
DSR	- Data Set Ready (RS-232)
DSR	- Digital Standard Runoff
DSR	- Dynamic Service Register
DSRI	- Digital Standard Relational Interface
DSS	- Data Station Selector
DSS	- Decision Support System
DSS	- Direct Station Selection [telephony]
DSSI	- Digital Storage Systems Interconnect
DST	- Daylight Saving Time
DSTN	- Double SuperTwisted Nematic
DSU	- Digital Service Unit; Data Service Unit
DSU	- Disk Subsystem Unit (Artecon)
DSX	- Digital System X-connect
DT	- Data Transmit
DT	- Delirium Tremens
DT	- Di-group Terminal
DTAS	- Digital Test Access System
DTB	- Data Transfer Bus
DTC	- Design To Cost
DTC	- Di-group Terminal Controller
DTC	- Digital Trunk Controller
DTE	- Data Terminal Equipment
DTF	- Dial Tone First payphone [telephony]
DTG	- Direct Trunk Group
DTI	- Department of Trade and Industry (U.K.)
DTIF	- Digital Transmission Interface Frame
DTL	- Diode Transistor Logic
DTMF	- Dial Tone Multi Frequency [telephony]
DTP	- DeskTop Publishing
DTR	- Data Terminal Ready
DTSS	- Dartmouth TimeSharing System
DTU	- Demand Transmission Unit
DTU	- Di-group Terminal Unit
DU	- Decision Unit
DUA	- Directory User Agent
DUATS	- Direct User Access Terminal System
DUI	- Driving Under the Influence
DUT	- Device Under Test
DUV	- Data Under Voice
DV	- Deo Vo lente (God willing)
DVC	- Digital Voice Card
DVM	- Digital Volt Meter
DVM	- Doctor of Veterinary Medicine
DVMA	- Direct Virtual Memory Access, see DMA, device uses MMU.
DVMRP	- Distance-Vector Multicast Routing Protocol
DVX	- Digital Voice eXchange
DW	- Dead Weight
DWAPS	- Defense Warehousing Automated Processing System
DWB	- Documenter's WorkBench
DWI	- Driving While Intoxicated
DWIM	- Do What I Mean
DX	- Distance (as in long distance radio communication)
DXT	- Data eXtractT facility
E	- East
E	- Espionage
E911	- Enhanced 911
EAA	- Experimental Aircraft Association
EADAS	- Engineering and Administrative Data Acquisition System
EADASNM	- Engineering and Administrative Data Acquisition System/Network Management, "EADAS/NM"
EADASS	- Engineering and Administrative Data AcquiSition System
EAEO	- Equal Access End Office
EAFB	- Edwards Air Force Base
EARN	- European Academic Research Network
EAS	- Engineering Administration System 
EAS	- Extended Announcement System
EAS	- Extended Area Service
EASD	- Equal Access Service Date
EASI	- Enhanced Asynchronous SCSI Interface
EBCDIC	- Extended Binary Coded Decimal Interchange Code
EBI	- Extensive Background Investigations
EC	- European Community
EC	- Exchange Carrier [telephony]
ECAD	- Electronical Computer Aided Design
ECAFE	- Economic Commission for Africa and the Far East
ECAP	- Electronic Customer Access Program
ECASS	- Electronically Controlled Automatic Switching System
ECASS	- Export Control Automated Support System
ECC	- Enter Cable Change
ECC	- Error Checking and Correcting
ECC	- Error Correction Code
ECCM	- Electronic Counter-CounterMeasures
ECCS	- Economic C (hundred) Call Seconds
ECD	- East Coast Division (Sun)
ECDO	- Electronic Community Dial Office
ECF	- Enhanced Connectivity Facility
ECG	- ElectroCardioGram
ECL	- Emitter Coupled Logic (see also TTL)
ECL	- Error Correction Logic
ECLSS	- Environmental Control and Life Support System [Space]
ECM	- Electronic Counter Measure
ECM	- European Common Market
ECMA	- European Computer Manufacturers Association
ECN	- Engineering Computer Network (at Purdue)
ECO	- Ecological
ECO	- Electronic Central Office
ECO	- Engineering Change Order
ECOM	- Electronic Computer Originated Mail, "E-COM"
ECPA	- Electronic Communication Privacy Act
ECPT	- Electronic Coin Public Telephone
ECR	- Engineering Change Request
ECS	- Electronic Crosconnect System
ECS	- Environmental Control System
ECSA	- Exchange Carriers Standards Association
ECT	- ElectroConvulsive Therapy
ECV	- Electric Cargo Vehicle [NASA OEXP]
EDA	- Electronic Design Automation
EDAC	- Electromechanical Digital Adapter Circuit
EDD	- Expert Dungeons & Dragons, "ED&D"
EDF	- Electricite de France
EDGAR	- Electronic Data Gathering, Analysis, and Retrieval
EDI	- Electronic Data Interchange
EDIF	- Electronic Design Interchange Format
EDO	- Extended Duration Orbiter [Space]
EDP	- Electronic Data Processing
EDS	- Electronic Data Systems
EDSX	- Electronic Digital Signal X-connect
EDT	- Eastern Daylight Time
EDTA	- Ethylene Diamine Tetraacetic Acid
EDTCC	- Electronic Data Transmission Communications Central
EE	- Electrical or Electronics Engineer
EEC	- European Economic Community
EECS	- Electrical Engineering and Computer Science
EECT	- End-to-End Call Trace
EEDP	- Expanded Electronic tandem switching Dialing Plan
EEG	- ElectroEncephaloGram
EEHO	- Either End Hop Off
EEI	- Equipment-to-Equipment Interface
EEL	- Epsilon Extension Language
EEM	- External Expansion Module (Sun)
EEO	- Errors and Omissions Excepted, "E&EO"
EEPROM	- Electrically Erasable Programmable Read Only Memory
EFD	- Ellington Field, Houston TX
EFI     - Electronics For Imaging (Co.)
EFIS    - Electronic Flight Instrumentation System
EFRAP	- Electronic Feeder Route Analysis Program
EFS	- Error Free Seconds
EG	- Exempli Gratia, "e.g." (for example)
EGA	- Enhanced Graphics Adapter
EGP	- Exterior Gateway Protocol
EGREP	- Extended GREP
EGRET	- Energetic Gamma Ray Experiment Telescope (on GRO)
EHF	- Extremely High Frequency (30-300GHz)
EHP	- Error Handling Package
EIA	- Electronics Industry Association
EIN	- Employer Identification Number
EINE	- EINE Is Not Emacs
EIS	- Environmental Impact Statement
EIS	- Executive Information Systems
EIS	- Expanded Inband Signaling
EIS	- Extended Instruction Set
EISA	- Extended Industry-Standard Architecture
EISB	- Electronic Imaging Standards Board
EISS	- Economic Impact Study System
EISS	- European Intelligence Support System
EITS	- Encoded Information TypeS
EJASA	- Electronic Journal of the Astronomical Society of the Atlantic
EKG	- ElectroKardioGramm (see ECG)
EKTS	- Electronic Key Telephone Sets
EL	- ElectroLuminescent (as in display)
ELC	- Extra(Excellent) Low Cost
ELF	- Extensible Linking Format
ELF	- Extremely Low Frequency
ELLE	- Elle Looks Like Emacs
ELM	- ELectronic Mailer
ELO	- Electric Light Orchestra
ELP	- Emerson, Lake and Palmer (or Powell)
ELT	- Emergency Locator Transmitter
ELV	- Expendable Launch Vehicle [Space]
EM	- Engineering Model
EM	- Enlisted Man (see EW)
EM	- ``Ear & Mouth''; recEive & transMit leads of a signalling system, "E&M"
EMA	- Electronic Mail Association
EMA	- Enterprise Management Architecture (DEC)
EMACS	- Editor MACroS; Eight Megabytes And Constantly Swapping
EMAIL	- Electronic MAIL, "E-MAIL"
EMC	- ElectroMagnetic Compatibility
EMF	- ElectroMotive Force
EMI	- ElectroMagnetic Interference
EML	- Expected Measured Loss
EMP	- ElectroMagnetic Pulse
EMPRESS	- EnvironMental Pulse Radiation Environment Simulator for Ships
EMR	- ElectroMagnetic Response
EMS	- Electronic Message System
EMS	- Element Management System
EMS	- Extended Memory Specification
EMS     - Element Management System, part of AT&T's UNMA
EMT	- Emergency Medical Technician
EMU	- ElectroMagnetic Unit
EMU	- Extravehicular Mobility Unit [Space]
ENEA	- Comitato Nazionale per la Ricerca e per lo Sviloppo dell' Energia Nuclaeare e delle Energie Alternative, Italy
ENET	- Ethernet, "E-Net"
ENFIA	- Exchange Network Facility for Interstate Access
ENIAC	- Electronic Numerical Integrator and Calculator
ENS	- ENSign
EO	- End Office [telephony]
EO	- Erasable Optical
EOD	- Erasable Optical Disk
EOE	- Electronic Order Exchange
EOE	- Equal Opportunity Employer
EOF	- End Of File
EOM	- End Of Month
EOS	- Earth Observing System
EOS	- Electrical OverStress
EOS	- Extended Operating System
EOT	- End Of Transmission
EOTT	- End Office Toll Trunking
EP	- Emulation Program
EP	- Experience Points
EP	- Extended Play
EPA	- Enhanced Performance Architecture
EPA	- Environmental Protection Agency
EPD	- Entry Products Division
EPL	- Electronic switching system Program Language
EPOS	- Engineering and Project-management Oriented Support system
EPPS	- Electronic Pre-Press Systems.
EPRI	- Electric Power Research Institute
EPROM	- Erasable Programmable Read-Only Memory
EPS	- Encapsulated PostScript
EPSCS	- Enhanced Private Switched Communication Service
EPSF	- Encapsulated PostScript File
EPSF	- Encapsulated PostScript Format
EPSI	- Encapsulated PostScript Interchange
EPT	- Empire of the Petal Throne
EPTS	- Electronic Problem Tracking System
EPUB	- Electronic PUBlication
EPW	- Enemy Prisoner of War
EQ	- Educational Quotient (see IQ)
EQUEL	- Embedded QUEL
ER	- Emergency Room
ER	- Error Register
ERA	- Earned Run Average
ERA	- Entity-Relationship-Attribute
ERA	- Equal Rights Amendment
ERAR	- Error Return Address Register
ERD	- Entity-Relationship Diagram
ERE	- Entity-Relationship Editor
EREP	- Environmental Recording Editing and Printing
ERICA	- Experiment on Rapidly Intensifying Cyclones over the Atlantic
ERICA	- Eyegaze Response Interface Computer Aid
ERISA	- Employee Retirement Income Security Act
ERL	- Echo Return Loss
ERP	- Effective Radiated Power
ERS	- Earth Resources Satellite (as in ERS-1)
ERT	- Earth Resources Technology [Space]
ERU	- Error Return address Update
ES	- End System
ES	- Expert System
ESA	- Enterprise Systems Architecture (MVS/XA followon)
ESA	- European Space Agency
ESAC	- Electronic Surveillance Assistance Center
ESAC	- Electronic Systems Assistance Center
ESB	- Emergency Service Bureau
ESD	- ElectroStatic Discharge
ESD	- Engineering Service Division
ESDI	- Enhanced Standard Device Interface
ESE	- East South East
ESF	- Extended SuperFrame
ESF	- Extended Superframe Format
ESH	- End System Hello
ESI	- ElectroStatic Interference
ESIS	- End System-Intermediate System, "ES-IS"
ESL	- Emergency Stand-Alone
ESM	- Electronic Support Measures
ESM	- External Storage Module (Sun)
ESMD	- Embeded Storage Module Disk
ESMD	- Enhanced Storage Module Device
ESN	- Electronic Serial Number
ESN	- Electronic Switched Network
ESO	- European Southern Observatory
ESOP	- Employee Stock Ownership Plan
ESP	- Enhanced Service Provider
ESP	- Extra Sensory Perception
ESPEC	- Ethernet SPECification (DIX)
ESPS	- Entropic Signal Processing System
ESS	- Electronic Switching System [telephony]
ESS	- Environmental Stress Screening
ESSEX	- Experimental Solid State EXchange
ESSX	- Electronic Switching Systen eXchange
EST	- Eastern Standard Time
ET	- Eastern Time
ET	- External Tank [of the US Space Shuttle]
ET	- ExtraTerrestrial [Space]
ETA	- Estimated Time of Arrival
ETACC	- External Tank/Aft Cargo Carrier, "ET/ACC" (see also ET) [Space]
ETAS	- Emergency Technical ASsistance
ETC	- Et cetera, and so on...
ETD	- Estimated Time of Departure
ETF	- Electronic Toll Fraud
ETFD	- Electronic Toll Fraud Device [telephony]
ETH	- Eidgnoessiche Techniche Hochschule
ETLA	- Extended Three Letter Acronym
ETN	- Electronic Tandem Network
ETO	- Earth-to-Orbit [Space]
ETR	- Eastern Test Range
ETS	- Electronic Tandem Switching
ETS	- Electronic Translation System
ETSACI	- Electronic Tandem Switching Adminstration Channel Interface
ETSI    - European Telecommunication Standards Institute
ETSSP	- ETS Status Panel
ETV	- Education TeleVision
EUC	- Extended Unix Code
EUNET	- European UNIX Network
EUNET	- European UNIX network, "EUnet"
EUUG	- European UNIX Users Group
EUV	- Extreme UltraViolet
EUVE	- Extreme UltraViolet Explorer
EVA	- ExtraVehicular Activity
EVX	- Electronic Voice eXchange
EW	- Electronic Warfare
EW	- Enlisted Woman (see EM)
EWO	- Engineering Work Order
EWOS	- European Workshop for Open Systems
EWS	- Engineering Work Station
EXPO	- World Exposition
FA	- Factory Automation
FA	- Finance Accounting (Sun)
FA	- Football Association (British soccer)
FA	- Fuse Alarm
FAA	- Federal Aviation Administration (U.S.)
FAB	- Feature-Advantage-Benefit
FACD	- Foreign Area Customer Dialing
FACOM	- Fujitsu Automatic Computer
FACS	- Facilities Assignment and Control System
FAE	- Fuel Air Explosive
FAESHED	- Fuel Air ExploSive, HElicopter Delivered
FAG	- Forced Air Gas
FAI	- Federation Aeronautique International
FAO	- Food and Agriculture Organization [U.S. Government]
FAQ	- Frequently-Asked Question(s)
FAQL	- Frequently-Asked Questions List
FAR	- Federal Acquisition Regulation
FAR	- Federal Aviation Regulations (U.S.)
FAR	- Federation of American Research
FARNET	- Federation of American Research NETworks
FAS	- Foreign Agricultural Service
FAS	- Free Alongside Ship
FASST	- Flexible Architecture Standard System Technology
FAST	- Fast Auroral SnapshoT explorer
FAST	- First Application System Test
FAT	- File Allocation Table
FAT	- Foreign Area Translation
FAX	- FAcsimile
FB	- Freight Bill
FBI	- Federal Bureau of Investigation [U.S. Government]
FBO	- Fixed-Base Operator
FBV	- a Dutch acronym for "Fluke, Ltd."
FC	- Full Color
FCAP	- Facility CAPacity
FCC	- Federal Communications Commission [U.S. Government]
FCC	- Federal Computer Conference
FCC	- Forward Command Channel
FCCSET	- Federal Coordinating Council for Science, Education and Technology (under OSTP)
FCFS    - First Come, First Served
FCG	- False Cross or Ground
FCO	- Field Change Order
FCRC	- Federal Contract Research Center
FCS	- File Control Systemction
FCS	- First Customer Ship (SunOS Releases)
FCS	- Frame Check/Control Sequence
FCT	- Four Corner Test (4FCT)
FD	- File Descriptor
FD	- Floppy/Flexible Disk(ette)/Drive
FDA	- Food and Drug Administration [U.S. Government]
FDDI	- Fiber Distributed Data Interface
FDDIII  - FDDI supporting isochronous traffic, "FDDI-II"
FDHD	- Floppy Drive High Density
FDIC	- Federal Deposit Insurance Corporation [U.S. Government]
FDM	- Frequency-Division Multiplexing
FDP	- Field Development Program
FDR	- Franklin Delano Roosevelt
FDX	- Full DupleX
FE	- Format Effecters
FE	- Front End
FEA	- Finite Element Analysis
FEC	- Forward Error Correction
FED	- Far End Data
FEDSIM	- FEDeral Systems Integration and Management center
FEHQ	- Fluke European HeadQuarters
FEM	- Finite Element Modeling
FEMA	- Federal Emergency Management Agency
FEMF	- Foreign Electro-Motive Force
FEP	- Fluorinated Ethylene Propylene
FEP	- Front End Processor
FEPC	- Fair Employment Practices Commission
FEPS	- Facility and Equipment Planning System
FERS	- Federal Employees Retirement System
FET	- Far East Trading
FET	- Federal Excise Tax
FET	- Field Effect Transistor
FEV	- Far End Voice
FF	- Flip-Flop
FFA	- Field Failure Analysis
FFA	- Future Farmers of America
FFRDC	- Federally Funded Reseach and Development Center
FFS	- Fast File System
FFT	- Fast Fourier Transform
FGA	- Feature Group A, "FG-A" [telephony:Line Side term. for LD carriers]
FGB	- Feature Group B, "FG-B" [telephony:Trunk Side term. for LD carriers (aka ENFIA B), 950 service]
FGC	- Feature Group C, "FG-C" [telephony]
FGD	- Feature Group D, "FG-D" [telephony:Trunk Side term. for LD carriers, 1+ service]
FGREP	- Fixed GREP
FGS	- Fine Guidance Sensors (on HST)
FHA	- Federal Housing Administration
FHA	- Future Homemakers of America
FHLMC	- Federal Home Loan Mortgage Association (Freddie Mac)
FHMA	- Federal Home Mortgage Association (Fannie Mae)
FHST	- Fixed Head Star Trackers (on HST)
FIB	- Focused Ion Beam
FICA	- Federal Insurance Contributions Act
FIDO	- Fog Investigation Dispersal Operation
FIFO	- First In, First Out
FILO	- First In, Last Out
FIMS	- Forms Interface Management System
FIN	- Field Information Notice
FINE	- FINE Is Not Emacs
FIO	- Frequency In and Out
FIOC	- Frame Input/Output Controller
FIP	- Facility Interface Processor
FIPS	- Federal Information Processing Standard
FIR	- Far InfraRed
FIR	- Field Information Report
FIR	- Finite Impulse Response
FIRMR	- Federal Information Resource Management Regulation
FIT	- Federal Information Technologies, inc.
FITS	- Flexible Image Transport System
FL	- Florida
FLACC	- Full Level Algol Checkout Compiler
FLOP	- FLoating point OPeration
FLOPS	- FLoating-point OPerations per Second
FLRA	- Federal Labor Relations Authority
FLS	- Floating License Server
FLT	- Front Load Tape
FM	- Frequency Modulation
FMAC	- Facility Maintenance And Control
FMB	- Federal Maritime Board
FMC	- Flexible Manufacturing Cell
FMCS	- Federal Mediation and Conciliation Service
FMEA	- Failure Mode and Effect Analysis
FMR	- Field Marketing Representative (Sun)
FMS	- Financial Management Service (Treasury Dept)
FMS	- Flexible Machining/Manufacturing System
FMS	- Forms Management System
FNC	- Federal Networking Council
FNPA	- Foreign Numbering Plan Area
FO	- Forecast Order
FO	- Foreign Office
FO	- Forward Observer
FOAC	- Federal Office Automation Center
FOB	- Free On Board
FOC	- Faint Object Camera (on HST)
FOC	- Fiber Optic Communications
FOC	- Free Of Charge
FOIA	- Freedom Of Information Act
FOIMS	- Field Office Information Management System
FOIRL	- Fiber Optic Inter Repeater Link
FON	- Fiber Optics Network
FOOBAR	- See FUBAR
FOR	- Free On Rail
FORCS	- Faa's Operational Reporting Communication System
FORD	- Fix Or Repair Daily
FORD	- Found On Road Dead
FORTRAN	- FORmula TRANslator
FOS	- Faint Object Spectrograph (on HST)
FOSE	- Federal Office Systems Exposition
FOT	- Fiber Optic Transceiver
FOT	- Free On Truck
FOV	- Field Of View
FPA	- Floating Point Accelerator
FPC	- Fish Protein Concentrate
FPC	- Floating Point Coprocessor
FPDU	- FTAM Protocol Data Unit
FPE	- Floating Point Engine
FPE	- Foam PolyEthylene
FPHA	- Federal Public Housing Authority
FPLA	- Field Programmable Logic Array (see PLA)
FPM	- Feet Per Minute
FPO	- Fleet Post Office
FPP	- Floating Point Processor
FPS	- Favorite Play Sequence
FPS	- Feet Per Second
FPS	- Foot-Pound-Second
FPU	- Floating Point Unit
FQDN	- Fully-Qualified Domain Name
FR	- Flat Rate
FRACTAL	- FRACTional dimensionAL
FRAM	- Ferroelectric RAM
FRB	- Federal Reserve Board
FRD	- Fire RetarDant
FRED	- Fred Resembles Emacs Deliberately
FREE	- Fathers Rights and Equality Exchange
FRG	- Federal Republic of Germany (West Germany)
FRICC	- Federal Research Internet Coordinating Committee
FROG	- Free Rocket Over Ground
FRPG	- Fantasy Role Playing Game
FRR	- Flight-Readiness Review
FRS	- Federal Reserve System
FRS	- Flexible Route Selection
FRU	- Field Replacable Unit
FS	- Field Service
FS	- File System
FS	- Floppy System
FSCM	- Federal Supply Code for Manufactures
FSDO	- Flight Standards District Office
FSE	- Field Service Engineer
FSF	- Free Software Foundation
FSK	- Frequency Shift Keying
FSLIC	- Federal Savings and Loan Insurance Corporation
FSS	- Fast System Switch (System V)
FSS	- Federal Supply Service
FSS	- Flight Service Station
FSU	- Florida State University
FSU	- Former Soviet Union
FSW	- Forward Swept Wings
FT	- Foot
FT1     - fractional T1, common carrier transmission in multiples of 64 kb/s
FTAM	- File Transfer, Access, and Management (ISO FTP equivalent)
FTC	- Federal Trade Commission
FTE	- Factory Test Equipment
FTG	- Final Trunk Group
FTL	- Faster Than Light
FTP	- File Transfer Protocol
FTPI	- Flux Transitions Per Inch
FTS	- Federal Telecommunications System [US Government]
FTS	- Federal Telephone System [telephony]
FTS	- Flight Telerobotic Servicer [Space]
FTW	- File Tree Walk
FTZ	- Free Trade Zone
FUBAR	- F***ed Up Beyond All Recognition
FUD	- Fear, Uncertainty, and Doubt
FUS	- Full-Use Standard
FUSE	- Far Ultraviolet Spectroscopic Explorer
FV	- folio verso, "fv" (on the back of the page)
FW	- Fringeworthy
FWD	- Front Wheel Drive
FWHM	- Full Width at Half Maximum
FWIW	- For What It's Worth
FX	- Foriegn eXchange [telephony]
FX	- special effects
FY	- Fiscal Year
FYA	- For Your Action
FYI	- For Your Information
FYS	- For Your Signature
G	- Gravity
GA	- Gamblers Anonymous
GA	- General Assembly
GA	- General Average
GA	- General of the Army
GA	- Georgia
GAAP	- Generally Accepted Accounting Principles
GAAS	- Gallium Arsenide, "GaAs"
GAB	- Group Audio Bridging [telephony]
GADO	- General Aviation District Office
GAIA	- Earth's self-sustaining Biosphere, "Gaia"
GAIA	- GUI Application Interoperability Architecture
GAN	- Global Area Network
GAO	- General Accounting Office
GAR	- Grand Army of the Republic
GAS	- Get-Away Special
GATED	- GATEway Deamon
GATT	- General Agreement on Tariffs and Trade
GAW	- Guaranteed Annual Wage
GB	- Gangbusters
GB	- GigaByte
GB	- Great Britain
GBIP	- General Purpose Interface Bus
GBS	- Group Bridging Service
GBT	- Green Bank Telescope
GC	- Garbage Collection (LISP)
GC	- Gas Chromatograph(y)
GC	- Graphic Context
GCA	- General Communications Architecture (Ingres)
GCA	- Ground Controlled Approach
GCC	- Gnu C Compiler
GCD	- Ground Controlled Descent
GCL	- Graphics Command Language
GCM	- General Court Martial
GCR	- Group-Coded Recording (magnetic tape, 6250 bpi)
GCS	- Group Control System
GCT	- Greenwich Civil Time
GCVS	- General Catalog of Variable Stars
GDB	- Gnu DeBugger
GDP	- Gross Domestic Product
GDS	- Great Dark Spot
GE	- General Electric
GECOS	- General Electric Comprehensive Operating System
GECR	- Global Environmental Change Report
GEIS	- General Electric Information Systems
GEISCO	- General Electric Information Services COmpany
GEM	- Giotto Extended Mission
GEM	- Graphics Environment Manager
GEMS	- General Electric Medical Systems
GEO	- Geosynchronous Earth Orbit [Space]
GFCI	- Ground Fault Circuit Interrupter
GGP	- Gateway-to-Gateway Protocol
GHQ	- General HeadQuarters
GHRS	- Goddard High Resolution Spectrograph (on HST)
GHZ	- Giga HertZ, "GHz" (unit of frequency, 1,000,000,000 cycles per second)
GI	- Galvanized Iron
GI	- Gastro Intestinal
GI	- General Issue
GI	- Government Issue
GID	- Group IDentity
GIF	- Graphics Interchange Format
GIGO	- Garbage In, Garbage Out
GIN	- Graphics INput
GISS	- Goddard Institute for Space Studies
GJIAGDVYFCN	- Go Jump In a God Damned Volcano, You Fucking Cave Newt (talk.bizarre)
GKS	- Graphical Kernel Standard
GKSM	- GKS Metafile
GLOMR	- Global Low-Orbiting Message Relay
GM	- Game Master
GM	- General Manager
GM	- General Motors
GM	- Guided Missile
GMBH	- Gesellschaft Mit Beschraenkter Haftung
GMC	- Giant Molecular Cloud
GMRT	- Giant Meter-wave Radio Telescope
GMT	- Greenwich Mean Time
GMW	- Give me More Windows
GND	- GrouND
GNMA	- Government National Mortgage Association (Ginnie Mae)
GNP	- Gross National Product
GNU	- GNU's Not Unix
GOES	- Geostationary Orbiting Environmental Satellites
GOK	- God Only Knows
GOP	- Grand Old Party
GOS	- Grade Of Service
GOSIP	- Government Open Systems Interconnection Profile
GOX	- Gaseous OXygen
GP	- General Practitioner
GP	- Grand Prix
GP	- Graphics Processor
GP	- Group Processor
GPC	- General Purpose Computer
GPCI	- Graphics Processor Command Interface
GPD	- Graphics Products Division
GPI	- Graphics Programming Interface
GPIB	- General-Purpose Interface Bus
GPL	- GNU Public License
GPL	- General Public License
GPL	- Graphics Programming Language
GPM	- Gross Product Margin
GPO	- General Post Office
GPO	- Government Printing Office
GPS	- General Problem Solver
GPS	- Global Positioning System [Space]
GPSI	- Graphics Processor Software Interface
GPSS	- General Purpose System Simulator
GQ	- General Quarters
GRASS	- Geographical Resources Analysis Support System
GRB	- Gamma Ray Burst(er)
GRD	- GRounD
GREP	- Global Regular Expression Print, g/re/p, (UNIX command)
GRI	- Graduate, Realtors Institute
GRIPS	- Government Raster Image Processing Software
GRO	- Gamma Ray Observatory [Space]
GROPE	- Graphical representation of protocols in Estelle
GRPMOD	- GRouP MODulator, "GRP MOD"
GRS	- Gamma Ray Spectrometer (on Mars Observer)
GRS	- Great Red Spot
GS	- General Schedule
GS	- Glide Slope
GS	- Gray-Scale
GSA	- General Services Adminstration [U.S. Government]
GSA	- Girl Scouts of America
GSA	- Government Services Administration
GSAT	- General telephone and electronics SATellite corporation
GSBCA	- General Services administration Board of Contract Appeals
GSC	- Guide Star Catalog (for HST)
GSFC	- Goddard Space Flight Center (Greenbelt, MD) [NASA]
GSTS	- Ground-based Surveillance and Tracking System
GT	- Gross Ton
GT	- Group Technology
GTC	- General Telephone Company
GTE	- General Telephone and Electric [Corporate name]
GTO	- Geostationary Transfer Orbit
GTSI	- Government Technology Services, inc.
GTT	- Global Title Transmission
GUI	- Graphical User Interface
GUIDE	- Graphical User Interface Design Editor (Sun)
GURPS	- Generic Universal Role-Playing System
GUS	- Guide to the Use of Standards (SPAG publication)
GW	- Gamma World
GWEN	- Ground Wave Emergency Network
GWS	- Graphics Work Station
H	- Harn
H	- Height
HA	- Home Automation
HACD	- Home Area Customer Dialing
HAL	- Hard Array Logic
HAL	- Heuristically programmed ALgorithmic computer (2001)
HAM	- Hold And Modify
HAO	- High Altitude Observatory
HAP	- Host Access Protocol
HARM	- High-Availability, Reliability, and Maintainability
HASP	- Houston Automated Spooling Program
HAT	- Hashed Address Table
HB	- HemogloBin, "Hb"
HBA	- Host Bus Adapter (SCSI)
HBM	- Her British Majesty; His British Majesty
HBO	- Home Box Office
HC	- Holy Communion
HC	- House of Commons
HCF	- Halt and Catch Fire
HCFA	- Health Care Financing Administration
HCL	- High Cost of Living
HCL	- Host Control Links
HCR	- Hodge Computer Research, inc.
HCSDS	- High-Capacity Satellite Digital Service
HCTDS	- High-Capacity Terrestrial Digital Service
HD	- Hard Disk
HD	- Heavy Duty
HD	- Henry Draper catalog entry
HDA	- Head Disk Assembly (in winchester disk drives)
HDBV	- Host Data Base View
HDL	- High Density Lipoprotein
HDLC	- High-level Data Link Control
HDTV	- High Definition TeleVision
HDX	- Half DupleX
HE	- His Eminence; His Excellency
HEAO	- High Energy Astronomical Observatory [satellite]
HEAP	- Home Energy Assistance Program
HEDM	- High Energy-Density Matter [Space]
HEHO	- High End Hop Off
HEM	- High-level Entity Management
HEMP	- Help End Marijuana Prohibition
HEMS	- High-level Entity Management System
HEMT	- High Electron Mobility Transistor
HEO	- High Earth Orbit [Space]
HEP	- High Energy Physics
HERA	- HErmes Robotic Arm, "HeRA"
HERO	- Hazards of Electromagnetic Radiation to Ordnance
HEW	- Health, Education, and Welfare
HF	- Hawthorne Farms (Intel)
HF	- High Fantasy
HF	- High Frequency (3-30MHz)
HFE	- Human Factors Engineering
HFS	- Hierarchical File System (Apple Macintosh)
HGA	- High Gain Antenna
HHS	- Health and Human Services
HI	- Hawaii
HIC	- Hybrid Integrated Circuit
HIFO	- Highest-In, First-Out
HIIPS	- Hud Integrated Information Processing Services
HIPPI   - HIgh Performance Parallel Interface
HIRES	- HI-RESolution
HIS	- Honeywell Information System
HIV	- Human Immuno-deficiency Virus
HLC	- Heavy Lift Capability [Space]
HLHSR	- Hidden Line & Hidden Surface Removal
HLL	- High-Level Language
HLV	- Heavy Lift Vehicle [Space]
HM	- High-resolution Monochrome
HMC	- Halley Multicolor Camera (on Giotto)
HMOS	- High performance Metal Oxide Semiconductor (see MOS)
HMP	- Host Monitoring Protocol
HMS	- His/Her Majesty's Ship
HMT	- His/Her Majesty's Transport
HNPA	- Home Numbering Plan Area [telephony]
HNS	- Hospitality Network Service
HOBIC	- HOtel Billing Information Center
HOBIS	- HOtel Billing Information System
HOL	- High-Order System
HOTOL	- HOrizontal Take-Off and Landing
HOW	- Home Owners Warranty
HP	- Hewlett-Packard, inc. [Corporate name]
HP	- High Pressure
HP	- Higher Power (sort of an AA "in" term, usually God)
HP	- Hit Points
HP	- HorsePower
HPD	- High Performance Division (Sun group)
HPGe	- High Purity Germanium
HPIB	- Hewlett-Packard Interface Bus
HPLT	- High-Productivity Languages/Tools, "HPL/T"
HPN	- White Plains NY
HPO	- High Performance Option
HPPA	- HP Precision Architecture
HQ	- HeadQuarters
HR	- Hertzsprung-Russell (diagram)
HR	- House of Representatives
HR	- Human Resources
HRH	- Her/His Royal Highness
HRI	- High Resolution Imager (on ROSAT)
HS	- High School
HSB	- Hue, Saturation, Brightness
HSC	- Hierarchical Storage Controller
HSFS	- High Sierra File System
HSI	- High Speed Interface
HSI	- Horizontal Situation Indicator
HSLN	- High Speed Local Network
HSP	- High Speed Photometer (on HST)
HSSDS	- High-Speed Switched Digital Service
HST	- Hawaiian Standard Time
HST	- High Speed Technology
HST	- Hubble Space Telescope
HT	- High Tension (as in electric power transmission)
HT	- Horizontal Tab
HTK	- Hits To Kill
HTTP	- HyperText Transfer Protocol
HU	- High Usage
HUAC	- House Unamerican Activities Committee
HUD	- Heads Up Display
HUD	- Housing and Urban Development [U.S. Government]
HUGE	- Hewlett-packard Unsupported Gnu Emacs
HUT	- Hopkins Ultraviolet Telescope (ASTRO package)
HUTG	- High Usage Trunk Group
HV	- High Voltage
HVAC	- Heating, Ventilation, and Air Conditioning
HW2000	- Highway 2000
HWD	- Hayward CA
HWM	- High-Water Mark
HZ	- HertZ, "Hz" (unit of frequency, cycles per second)
I18N	- InternationalizatioN (count the letters)
IA	- Inspection Authorization
IAB	- Interactive Application Builder
IAB	- Internet Activities Board
IAD	- Dulles International, Washington DC
IAEA	- International Atomic Energy Agency
IAH	- Houston (Intercontinental) TX
IANA	- Internet Assigned Numbers Authority
IAPPP	- International Amateur/Professional Photoelectric Photometry
IATA	- International Air Transport Association
IAU	- International Astronomical Union
IAUC	- IAU Circular
IB	- Instruction Buffer
IBM	- Ingrained Batch Mentality
IBM	- International Brotherhood of Magicians
IBM	- International Business Machines [Corporate name]
IBM	- Itty Bitty Machines
IBN	- Integrated Business Network
IC	- Independent Carrier
IC	- Integrated Circuit
IC	- Inter-LATA Carrier
IC	- Interexchange Carrier [telephony] (see also IEC)
ICAN	- Individual Circuit ANalysis
ICB	- Interstate Computer Bank
ICBM	- InterContinental Ballistic Missile
ICBW	- I Could Be Wrong
ICC	- Interstate Commerce Commission
ICCC	- Inter-Client Communication Convention (X)
ICCCM	- Inter-Client Communication Conventions Manual
ICD	- Interactive Call Distribution
ICE	- In-Circuit Emulator
ICE	- International Cometary Explorer
ICE	- Intrusion Countermeasures Electronics
ICI	- Imperial Chemical Industries
ICJ	- International Court of Justice
ICL	- International Computers Limited
ICLID	- Individual Calling Line ID
ICM	- Integrated Call Management
ICMP	- Internet Control Message Protocol
ICON	- Inter CONtinental
ICP	- Integrated Channel Processor
ICP	- Inventory Control Points
ICRC	- International Cosmic Ray Conference
ICSC	- Inter-LATA Customer Service Center
ICST	- Institute for Computer Science and Technology
ICT	- In-Circuit Test
ICT	- Interactive Consumer Terminal
ID	- IDentification
ID	- Idaho
IDA	- Intercommunication Data Areas
IDA	- International Dark-sky Association
IDA	- International Development Association
IDC	- Insulation Displacement Contact
IDCMP	- Intuition Direct Communications Message Port
IDDD	- International Direct Distance Dial [telephony]
IDE	- Integrated Development Environment
IDE	- Integrated Drive Electronics
IDE	- Interactive Development Environments, inc
IDEA	- International Dance Exercise Association
IDEA	- Internet Design, Engineering, and Analysis notes (IETF RFCs)
IDF	- Intermediate Distributing Frame [telephony]
IDI	- Initial Domain Identifier
IDL	- Interactive Data Language
IDL	- Interface Description Language
IDM	- Image Data Manager
IDP	- Initial Domain Part
IDP	- Internet Datagram Protocol (XNS equivalent to IP)
IDS	- Internal Directory System
IDV	- Interlibrational Derived Vehicle [Space]
IDVC	- Integrated Data/Voice Channel
IE	- Id Est (that is)
IE	- Id Est, "i.e." (that is)
IE	- Indo-European
IE	- Inter Ethernet
IEC	- InterExchange Carrier [telephony] (see also IC)
IEC	- International Electrotechnical Commission
IEE	- Institute of Electrical Engineers (UK)
IEEE	- Institute of Electrical and Electronics Engineers
IEN	- Internet Engineering Notes
IEN	- Internet Experiment Notebook (precedes RFCs)
IESG	- Internet Engineering Steering Group
IETF	- Internet Engineering Task Force
IF	- InterFace, "I/F"
IF	- Intermediate Frequency
IFB	- Invitation For Bids
IFC	- International Finance Corporation
IFC	- International Freighting Corporation
IFF	- Identification - Friend or Foe
IFF	- Image File Format
IFF	- Interchange File Format
IFF	- Iterative Function Fractal
IFIP	- International Federation for Information Processing
IFLA	- International Federation of Library Associations
IFR	- Instrument Flight Rules
IFRPS	- Intercity Facility Relief Planning System
IGES	- Initial Graphics Exchange Standard
IGM	- InterGalactic Medium
IGMP	- Internet Group Multicast Protocol
IGP	- Interior Gateway Protocol
IGY	- International Geophysical Year
IHP	- Indicated HorsePower
IHS	- Integrated Hospital Support
IIA	- Information Industry Association
IIE	- Institute of Industrial Engineers
IIHF	- International Ice Hockey Federation
IIL	- Integrated Injection Logic
IIN	- Integrated Information Network
IISPB	- Image and Information Standards Policy Board
ILO	- International Labor Organization
ILS	- Instrument Landing System
ILV	- Industrial Launch Vehicle [Space]
IM	- Installation & Maintenance, "I&M"
IM	- Interface Module
IMAP	- Interactive Mail Access Protocol
IMAP3	- Interactive Mail Access Protocol - Version 3
IMAS	- Integrated Mass Announcement System
IMC	- Instrument Meteorological Contitions
IMD	- Industry Marketing Development
IMF	- International Monetary Fund
IMHO	- In My Humble Opinion [net jargon]
IMM	- Input Message Manual
IMO	- In My Opinion  [net jargon]
IMP	- Interface Message Processor [ARPANET/MILNET] (replaced by PSN)
IMPACT	- Inventory Management Program and Control Technique
IMS	- Integrated Management System
IMSA	- International Motor Sports Association
IMSL	- International Mathematical Subroutine Library
IMSO	- Integrated Micro Systems Operation (Intel)
IMSVS	- Information Management System/Virtual Storage, "IMS/VS"
IMT	- Image Management Terminal
IMT	- Inter-Machine Trunk
IMTS	- Improved Mobile Telephone Service
IN	- Indiana
IN	- Intelligent Network
INADS	- INitialization and ADministration System  [telephony]
INC	- InterNational Carrier
INGRES	- Interactive Graphic Retrieval System
INL	- Inter Node Link
INMS    - integrated network management system, part of AT&T's UNMA
INN	- Inter Node Network
INN	- InterNet News
INOC	- Internet Network Operations Center
INRI	- Iesus Nazerenus Rex Iudaeorum (Jesus of Nazareth, King of the Jews)
INRIA	- Institut National de Recherche en Informatique et Automatique
INS	- Immigration and Naturalization Service
INS	- Inertial Navigation System
INS	- Information Network System
INSTITUTE	- INSTITUTE's Name Shows That It's Totally Unrelated To EMACS
INTAP	- INteroperability Technology Association for information Processing
INTELSAT	- INternational TELecommunications SATellite consortium
INWATS	- INward Wide Area Telephone Service [telephony]
IO	- Input/Output (sometimes I/O)
IO	- Input/Output, "I/O"
IO	- Inward Operator
IOC	- Input/Output Computer (Aptec)
IOC	- Input/Output Controller
IOC	- International Operating Center [telephony, US]
IOCC	- International Overseas Completion Center
IOD	- Identified Outward Dialing
IONL	- Internal Organization of the Network Layer
IOOF	- International Order of Odd Fellows
IOP	- Input-Output Processor
IOT	- InterOffice Trunk
IOTA	- Infrared-Optical Telescope Array
IOTA	- International Occultation Timing Association
IOU	- I Owe you (U)
IOW	- In Other Words
IP	- Industrial Products
IP	- Information Provider [telephony]
IP	- Innings Pitched
IP	- Intermediate Point
IP	- Internet Protocol
IPBSAY	- Udentstay Informationay Ocessingpray Oardbay
IPC	- Integrated Personal Computer
IPC	- InterProcess Communication
IPC	- Inventory Process Control
IPCC	- Intergovernmental Panel on Climate Change
IPCE	- InterProcess Communication Environment
IPCS	- Interactive Problem Control System
IPDU	- Internet Protocol Data Unit
IPE	- Integrated Programming Environment
IPI	- Intelligent Peripheral Interface
IPL	- Initial Program Load
IPLAN	- Integrated PLanning And Analysis
IPM	- Impulses Per Minute
IPM	- Interruptions Per Minute
IPMS	- InterPersonal Message Services
IPO	- Initial Public Offering
IPO	- International Procurement Office 
IPS	- Inches Per Second
IPS	- Inertial Pointing System
IPS	- Information Processing Standards
IPSE	- Integrated Project-Support Environment
IPT	- Williamsport PA
IPX     - Internetwork Packet exchange (of Novell Inc.)
IQ	- Intelligence Quotient (see EQ)
IQR	- Inquiry
IR	- Index Register
IR	- Information Resource
IR	- InfraRed
IR	- Internetwork Router
IRA	- Individual Retirement Account
IRA	- Interprocedural Register Allocation
IRA	- Irish Republican Army
IRAF	- Image Reduction and Analysis Facility
IRAS	- Infrared Astronomical Satellite
IRBM	- Intelligent Repeater Bridge Module
IRBM	- Intermediate Range Ballistic Missile
IRC	- International Record Carrier
IRC	- Internet Relay Chat
IRD	- Investment Recovery Department
IRDS	- Information Resource Dictionary Standard
IRDS	- InfraRed Detection Set
IRE	- Institute of Radio Engineers (old name for the now IEEE, q.v.)
IRG	- InterRecord Gap
IRM	- Information Resources Management
IRM	- Intelligent Repeater Module
IRMS	- Information Resources Management Service
IRN	- Intermediate Routing Node
IROR	- Internal Rate Of Return
IRS	- Inertial Reference System
IRS	- Internal Revenue Service
IRSG	- Internet Research Steering Group
IRTF	- Internet Research Task Force
IS	- Information Separator
IS	- Information Systems
IS	- Intermediate System
IS	- International Standard
IS	- Interrupt Set
ISA	- Industry-Standard Architecture
ISAM	- Indexed Sequential Access Method
ISAS	- Institute of Space and Astronautical Science (Japan)
ISBD	- International Bibliographic Description
ISBN	- International Standard Book Number
ISC	- Information Services Center
ISC	- Interactive Systems Corporation
ISC	- International Switching Center
ISCH	- Interstitial-Cell-Stimulating Hormone (same as LH)
ISDN	- Integrated Services Digital Network
ISDT	- Integrated Systems Development Tool
ISEE	- International Sun Earth Explorer (usually ISEE-3)
ISF	- Information Systems Factory
ISFUG	- Integrated Software Federal User Group
ISH	- Intermediate System Hello
ISI	- Information Sciences Institute (at USC)
ISIS	- Intermediate System to Intermediate System, "IS-IS"
ISLM	- Integrated Services Line Module
ISLU	- Integrated Services Line Unit
ISM	- InterStellar Medium
ISN	- Information Systems Network
ISN	- Integrated Systems Network
ISO	- Infrared Space Observatory
ISO	- International Standards Organization
ISODE	- ISO Development Environment
ISOO	- Information Security Oversight Office
ISOP	- Incentive Stock Option Plan
ISPM	- International Solar Polar Mission
ISR	- Institute of Snow Research
ISRG	- Independent Space Research Group
ISS	- Integrated Switching System
ISSI	- Information Security Systems Inc.
ISSN	- Integrated Special Services Network
ISSN	- International Standard Serial Number
IST	- Initial System Test
ISUP	- Integrated Services User Part
ISV	- Independent Software Vendor
ISV	- Instantaneous Speed Variation
ISY	- International Space Year
IT	- Industrial Technology
IT	- Information Technology
ITC	- Independent Telephone Company
ITC	- Inter-Task Communication
ITM	- Information Technology Management
ITS	- Incompatible Timesharing System
ITS	- Institute of Telecommunication Science
ITSEC	- Information Technology Security Evaluation Criteria
ITSO	- Incoming Trunk Service Observation
ITT	- International Telephone and Telegraph
ITU	- International Telecommunications Union
ITUSA	- IT Users Standards Association
IU	- Integer Unit
IUD	- Intra-Uterine Device
IUE	- International Ultraviolet Explorer
IUS	- Inertial Upper Stage [Space]
IUV	- Interlibrational Utility Vehicle [Space]
IVDT	- Integrated Voice/Data Terminal
IVP	- Installation Verification Program
IVTS	- International Video Teleconferencing Service
IWBNI	- It Would Be Nice If
IWC	- Inside Wire Cable
IWS	- Intelligent Work-Station
IWW	- International Workers of the World
IX	- Interactive eXecutive
IXC	- IntereXchange Carrier (aka LD)
IXM	- IntereXchange Mileage
JACM	- Journal of the Association for Computing Machinery
JAL	- Japan Airline
JANET	- Joint Academic Network (U.K.)
JBS	- John Birch Society
JC	- Jesus Christ
JC	- Joint Compound (plumbing)
JC	- Julius Caesar
JC	- Junior College
JCA	- Jewelry Crafts Association
JCAC	- Joint Civil Affairs Committee
JCAE	- Joint Committee on Atomic Energy
JCEE	- Joint Council on Economic Education
JCET	- Joint Council on Educational Television
JCL	- Job Control Language
JCS	- Joint Chiefs of Staff
JD	- Justice Department
JDS	- John Dewey Society
JECC	- Japan Electronic Computer Company
JEIDA	- Japan Electronics Inderstry Development Association
JEM	- Japanese Experiment Module (for SSF)
JES	- Job Entry System
JES	- John Ericsson Society
JESUS	- Job Entry System of the University of Saskatuan
JFET	- Junction FET
JFIF	- JPEG File Interchange Format
JFK	- John F. Kennedy (and the international airport)
JFMIP	- Joint Financial Management Improvement Program
JFS	- Next Generation of JLE
JGR	- Journal of Geophysical Research
JI	- Justice, Inc.
JIC	- Joint Industry Council
JIC	- Joint Intelligence Center
JIC	- Just in Case
JILA	- Joint Institute for Laboratory Astrophysics
JIM	- Job Information Memorandum
JINTACCS	- Joint INteroperability of TActical Command and Control Systems
JIS	- Japan Industrial Standards
JISC	- Japanese Industrial Standards Committee
JIT	- Just In Time
JLE	- Japanese Language Enveronment
JMS	- John Milton Society
JMX	- Jumbogroup MultipleX
JO	- Job Order
JO	- Junior Officer
JOAT	- Jack Of All Trades
JOVE	- Jonathan's Own Version of Emacs
JOVIAL	- Jules Own Version of the International Algorithmic Language
JPEG	- Joint Photographic Experts Group
JPL	- Jet Propulsion Laboratory
JRC	- Junior Red Cross
JSC	- Johnson Space Center (NASA)
JSD	- Jackson System Development
JSN	- Junction Switch Number
JSRC	- Joint Services Review Committee
JST	- Japan Standard Time
JSW	- Junctor SWitch
JTIDS	- Joint Tactical Information Distribution Systems
JTM	- Job Transfer and Manipulation
JUNET	- Japan UNIX Network
JV	- Junior Varsity
JVNC	- John von Neumann (Super Computer) Center, "JvNC"
JVNCNET	- John von Neumann (Super Computer) Center network, "JvNCnet"
K	- Kilobit
K9	- canine (K9 corps - army dogs)
KAO	- Kuiper Airborne Observatory
KAOS	- Killing as Organized Sport
KB	- Key Board
KB	- KiloByte
KBPS	- KiloBits Per Second
KBS	- Knowledge-Based System
KC	- King's Counsel (QC when queen reigning)
KC	- Knights of Columbus
KCL	- Kyoto Common Lisp
KD	- Kiln Dried
KD	- Knocked Down; Knock-Down
KDCI	- Key Display Call Indicator
KDD	- Kokusai Denshin Denwa Co.
KDT	- Keyboard Display Terminal
KERMIT	- Kl-10 Error-free Reciprocal Micro Interconnect over Tty lines
KFT	- KiloFeeT
KGB	- Komitet Gosudarstvennoi Bezopaznosti
KHz	- Kilo HertZ (unit of frequency, 1000 cycles per second)
KI	- Kiwanis International
KIA	- Killed In Action
KIAS	- Knot Indicated Air Speed
KIF	- Key Index File
KIP	- Kinetics IP
KIPS	- Kawasaki Integrated Power-valve System
KISS	- Keep it simple, stupid
KKK	- Ku Klux Klan
KLIPS	- thousands of Logical Inferences Per Second
KLM	- Koninglijke Luchtvaart Maatschapij [Corporate name]
KLOC	- thousands of Lines Of Code
KMPH	- KiloMeters Per Hour
KO	- Knock Out
KOWC	- Key Word Out of Context
KP	- Key Pulse [telephony]
KP	- Kitchen Police
KPNO	- Kitt Peak National Observatory
KPO	- KeyPunch Operator
KQC	- King's College London
KR	- Kernighan and Ritchie, the c programming language, "K&R"
KS	- King's Scholar
KSC	- Kennedy Space Center (NASA)
KSF	- Key Success Factor
KSH	- Korn SHell
KSR	- Keyboard Send-Receive
KSU	- Key System Unit [telephony]
KTB	- Cretaceous-Tertiary Boundary (from German)
KTS	- Key Telephone System [telephony]
KTU	- Key Telephone Unit [telephony]
KWIC	- Key Word In Context
KY	- Kentucky
L1	- Lagrange Point #1 35,000 Miles above moon [Space]
L2	- Lagrange Point #2 40,000 Miles behind moon [Space]
L3	- Lagrange Point #3 (?? 35,000 Miles below moon) [Space]
L4	- Lagrange Point #4 240,000 mile Earth orbit [Space]
L5	- Lagrange Point #5 240,000 mile Earth orbit [Space]
LA	- Los Angeles
LA	- Louisiana
LA	- Low Altitude
LAB	- Labor
LAC	- Loop Assignment Center
LADAR	- LAser Detection And Ranging
LADT	- Local Access Data Transport
LAIS	- Local Automatic Intercept System
LAL	- Local Analog Loopback
LAM	- Master of Liberal Arts
LAMA	- Local Automatic Message Accounting [telephony]
LAN	- Local Apparent Noon
LAN	- Local Area Network
LANCE	- Local Area Network Controller for Ethernet
LANL	- Los Alamos National Laboratory
LAP	- Link Access Procedure
LAPB	- Link Access Procedure - Balanced (X.25)
LAPD	- Link Access Procedure on the D channel
LAPD	- Los Angeles Police Department
LAPM	- Link Access Procedure for Modems
LAR	- Local Acquisition Radar
LARC	- Langley Research Center, "LaRC" [NASA]
LASER	- Light Amplification by Stimulated Emission of Radiation
LASS	- Local Area Signaling Service
LAT	- Local Apparent Time
LAT	- Local Area Transport (DEC)
LATA	- Local Access Transport Area
LATIS	- Loop Activity Tracking Information System
LAVC	- Local Area VAX Cluster
LAX	- Los Angeles International Airport
LB	- Light Bomber
LB	- pound (LiBra)
LBHS	- Long Beach High School
LBL	- Lawrence Berkeley Labs
LBO	- Line Buildout
LBS	- Load Balance System
LBS	- Pounds
LC	- Lower Case, "l.c."
LC	- inductor-Capacitor circuit (as in filters, L is symbol inductance)
LCA	- Logic Cell Array
LCAMOS	- Loop CAble Maintenance Operation System
LCCIS	- Local Common Channel Interoffice Signaling
LCCL	- Line Card CabLe
LCCLN	- Line Card Cable Narrative
LCD	- Liquid Crystal Display
LCD	- Lowest Common Denominator
LCDN	- Last Called Directory Number
LCDR	- Lieutenant Commander
LCIE	- Lightguide Cable Interconnection Equipment
LCL	- Lunar Cargo Lander [NASA OEXP]
LCLOC	- Line Card LOCation
LCM	- Life Cycle Management
LCN	- Logical Channel Numbers
LCP	- Link Control Protocol
LCR	- Least Cost Routing
LCRMKR	- Line Card ReMarKs, Retained
LCS	- Laboratory for Computer Science [MIT]
LCSE	- Line Card Service and Equipment
LCSEN	- Line Card Service and Equipment Narrative
LCT	- Landing Craft Tanks
LDC	- Logical Device Coordinates
LDC	- Long Distance Carrier [telephony]
LDEF	- Long Duration Exposure Facility
LDF	- Large Deployable Reflector [Space]
LDL	- Local Digital Loopback
LDL	- Low Density Lipoprotein
LDMTS	- Long Distance Message Telecommunications Service
LDP	- Laboratory Data Products
LDS	- The Church of Jesus Christ of Latter-Day Saints
LDX	- Long Distance eXtender [telephony]
LE	- Lance Ethernet
LEAP	- Low-power Enhanced At Portable
LEAS	- LATA Equal Access System
LEC	- Local Exchange Carrier [telephony]
LED	- Light-Emitting Diode
LEGO	- Low End Graphics Option
LEM	- Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft)
LENCL	- Line Equipment Number CLass
LEO	- Low Earth Orbit [Space]
LERC	- Lewis Research Center, "LeRC" [NASA]
LEST	- Large Earth-based Solar Telescope
LF	- Line Feed Character
LF	- Line Finder
LF	- Low Frequency (30-300KHz)
LFACS	- Loop Facilties Assignment And Control System
LFS	- Loopback File System
LFSA	- List of Frequently Seen Acronyms
LGA	- Low Gain Antenna
LGB	- Lesbian/Gay/Bisexual
LGB	- Long Beach CA
LGBO	- Lesbian/Gay/Bisexual and any others we've missed, "LGBO*"
LGM	- Little Green Men
LH	- Left Hand
LH	- Liquid Hydrogen (also LH2 or LHX)
LH	- Lower Half
LH	- Luteinizing Hormone (same as ISCH)
LHD	- Litterarum Humaniorum Doctor (doctor of human letters)
LHS	- Left Hand Side
LI	- Long Island
LIDAR	- LIght Detection And Ranging
LIFIA	- Laboratoire d'Informatique Fondamentale et d'Intelligence Artificielle
LIFO	- Last In, First Out
LIM	- Lotus-Intel-Microsoft (memory specification)
LIMM	- Lotus Intel Microsoft Memory (PC world)
LINC	- Laboratory INstrument Computer
LIPS	- Logical Inferences Per Second
LISA	- Large Installation System Administration
LISP	- LISt Processing Language
LIST	- List-Oriented Interactive Language
LIU	- Line Interface Unit
LJBF	- Let's Just Be Friends
LL	- Late Latin
LL	- Long Lines [telephony]
LLAMA	- Logic Lacking A Meaningful Acronym
LLB	- Legum Baccalaureus (bachelor of laws)
LLC	- Logical Link Control
LLCLINK	- Layer Control Protocol (?), "LLCLink"
LLD	- Legum doctor (doctor of laws)
LLN	- Line Link Network [telephony]
LLNL	- Lawrence-Livermore National Laboratory
LLO	- Low Lunar Orbit [Space]
LLOX	- Lunar Liquid OXygen [Space]
LLP	- Line Link Pulsing [telephony]
LM	- Lan Manager
LM	- Life Master (Contract Bridge ranking)
LM	- Lunar Module (a.k.a. LEM) (Apollo spacecraft)
LMC	- Large Magellanic Cloud (see SMC)
LME	- Layer Management Entity
LMF	- License Management Facility
LMMS	- Local Message Metering System
LMOS	- Line Maintenance Operations System [telephony, AT&T]
LN2	- Liquid N2 (Nitrogen)
LNF 	- Late Night Food
LNG	- Liquified Natural Gas
LNS	- Laboratory for Nuclear Science [MIT]
LO	- Lake Oswego
LO	- Leverage Out
LOA	- Lands of Adventure
LOA	- Leave Of Absence
LOB	- Line Of Balance
LOB	- Line Of Building
LOC	- Lines Of Code
LOC	- Local Operating Company
LOCAP	- LOw CAPacitance
LOE	- Level Of Effort
LOF	- Lock OFf-line
LOFT	- Launch Operations Flight Test [Space]
LOI	- Letter Of Intent
LON	- Lock ON-line
LOOPS	- Lisp Object Oriented Programming System
LOP	- Lines Of Position
LORAN	- Long RANge Navigation
LOS	- Line Of Sight
LOS	- Los Angeles
LOSF	- Lunar Orbit Staging Facility [Space]
LOTS	- Low Overhead Timesharing System
LOX	- Liquid OXygen
LP	- Linear Programming
LP	- Long Play(ing) (record)
LP	- Low Pressure
LPC	- Linear Predictive Coding (speech processing)
LPCDF	- Low Profile Combined Distributing Frame
LPDA	- Link Problem Determination Aid
LPF	- League for Programming Freedom
LPG	- Liquified Petroleum Gas
LPG	- Low Pressure Gas
LPL	- Lunar Personnel Lander [NASA OEXP]
LPN	- Licensed Practical Nurse
LPP	- Licensed Program Products
LPR	- Line PrinteR
LPT	- Lunar Propellant Tanker [NASA OEXP]
LPV	- Lunar Piloted Vehicle [NASA OEXP]
LRAP	- Long Route Analysis Program
LRB	- Liquid Rocket Booster [Space]
LRBM	- Long Range Ballistic Missile
LRC	- Longitudinal Redundancy Character
LRS	- Line Repeater Station
LRSP	- Long Range System Plan
LRSS	- Long Range Switching Studies
LRU	- Least Recently Used
LRU	- Line Replaceable Unit
LS	- Left Side
LS	- Letter Signed
LS	- Locus Sigilli (place of seal)
LSAP	- Long Service Access Point
LSB	- Least Significant Bit; Least Significant Byte
LSB	- Lower Side Band
LSC	- Lecture Series Committee [MIT]
LSC	- LightSpeed C
LSD	- Least Significant Digit
LSD	- LySergic acid Diethylamide
LSD	- pounds (Libra), shillings (Sestertii), and (old) pence (Denarii)
LSELLINK- Layer Selector (?), "LSELLink"
LSI	- Large Scale Integration
LSP	- LightSpeed Pascal
LSR	- Local Standard of Rest
LSRP	- Local Switching Replacement Planning system
LSS	- Life Support System
LSS	- Loop Switching System
LSSD	- Level-Sensitive Scan Detection
LSV	- Line Status Verifier
LT	- Long Ton
LT	- Low Tension
LTA	- Lighter Than Air
LTAB	- Line Test Access Bus
LTC	- Lieutenant Colonel
LTC	- Local Test Cabinet
LTD	- Local Test Desk
LTF	- Lightwave Terminating Frame
LTF	- Line Trunk Frame
LTG	- Line Trunk Group
LTJG	- Lieutenant Junior Grade
LTL	- Less than Truckload Lot
LTP	- Lunar Transient Phenomenon
LTPD	- Lot Tolerance Percent Deffective
LTS	- Loss Test Set
LTV	- Loan To Value
LTVR	- LTV Ratio
LU	- Logical Unit
LUG	- Local Users Group
LUN	- Logical Unit Number
LUT	- Look-Up Table
LWM	- Low-Water Mark
LWP	- Light Weight Process
LWSP	- Linear White-SPace
LWT	- Last Will and Testament
LXE	- Lightguide eXpress Entry
LZ	- Landing Zone
M	- Miniatures
MA	- Maintenance Administrator
MA	- Massachusetts [US state postal designation]
MA	- Master of Arts (originally, Artium Magister)
MAAP	- Maintenance And Administration Panel
MAC	- Mandatory Access Control
MAC	- Media Access Control
MAC	- Military Air Command
MAC	- Move, Add, Change
MAC	- Multiple Analogue Component
MACBS	- Multi-Access Cable Billing System
MACSYMA	- project MAC's SYmbolic MAnipulation System
MAD	- Mass Air Delivery
MAD	- Mutual Assured Destruction
MADD	- Mothers Against Drunk Driving
MADN	- Multiple Access Directory Numbers
MAF	- Marine Abkuerzungs Fimmel (roughly navy abbreviation spleen?)
MAG	- Magazine
MAN	- Metropolitan Area Network
MAP	- Maintenance and Administration Position
MAP	- Management Assesment Program
MAP	- Manufacturing Automation Protocol (GM's Token-Passing "Ethernet")
MAP	- Marketing Assistance Program
MAPSS	- Maintenance & Analysis Plan for Special Services
MAPTOP	- Manufacturing Automation Protocol/Technical Office Protocol, "MAP/TOP"
MAR	- Microprogram Address Register
MARBI	- MAchine Readable form of Bibliographic Information
MARC	- MAchine Readable card Catalog
MARC	- Market Analysis of Revenue and Customers system
MARS	- Multiuser Archival and Retrieval System
MAS	- MAin Store
MAS	- Mass Announcement System
MASB	- MAS Bus
MASC	- MAS Controller
MASC	- Multiple Award Schedule Contract
MASER	- Microwave Amplification by Stimulated Emission of Radiation
MASH	- Mobile Army Surgical Hospital
MASM	- MAS Memory
MAST	- Multi-Application SOnar Trainer
MATCALS	- Marine Air Traffic-Control And Landing System, "MAT-CALS"
MATFAP	- Metropolitan Area Transmission Facility Analysys Program
MAU	- Math Acceleration Unit
MAU	- Media Access Unit
MAU	- Medium Attachment Unit
MAU	- Multiple Access Unit
MAU	- Multistation Access Unit
MAXI	- Modular Architecture for the Exchange of Information (DoD)
MB	- Manned Base
MB	- MegaByte (1MB=1048576 bytes)
MBA	- Management Business Analyst
MBA	- Master Business Administration
MBO	- Management By Objectives
MBPS	- MegaBits/Bytes Per Second
MBWA	- Management By Walking Around
MC	- Management Committee
MC	- Master of Ceremonies
MC	- Material Control
MCA	- Mechanical Computer Aided Design
MCA	- Micro Channel Architecture
MCAD	- Mechanical Computer Aided Design
MCAE	- Mechanical Computer Aided Engineering
MCAS	- Marine Corps Air Station
MCC	- Master Control Center
MCC	- Master Control Console
MCC	- Microelectronics & Computer Consortia (Austin based)
MCC	- Mission Control Center
MCCS	- Mechanized Calling Card Service
MCH	- Maintenance CHannel
MCHB	- Maintenance CHannel Buffer
MCI	- Media Control Interface
MCI	- Microwave Communications Incorporated
MCIAS	- Multi-Channel Intelligent/Intercept Announcement System
MCN	- Metropolitan Campus Network
MCNC	- Microelectronics Center of North Carolina
MCP	- Master Control Program
MCP	- Multiport/Multiprotocol Communication Processor
MCPAS	- Master Control Program/Advanced System, "MCP/AS"
MCPO	- Master Chief Petty Officer
MCR	- Memory ContRoller
MCS	- Material Control System
MCS	- Meeting Communications Service
MCSV	- Mars Crew Sortie Vehicle [NASA OEXP]
MCTRAP	- Mechanized Customer Trouble Report Analysis Plan
MCU	- Microprocessor Control Unit
MD	- Doctor of Medicine
MD	- Management Domain
MD	- Maryland [US state postal designation]
MD	- Medical Doctor
MD	- Months after Date
MDACS	- Modular Digital Access Control System
MDAS	- Magnetic Drum Auxiliary Sender
MDC	- Marker Distributor Control
MDC	- Meridian Digital Centrex
MDDS	- Media Documentation Distribution Set
MDE	- Modular Design Environment
MDEC	- MAINDEC maintenance on DEC diagnostic paper tapes
MDF	- Main Distribution Frame [telephony]
MDI	- Medium Dependent Interface
MDQS	- Multi-Device Queueing System
MDRE	- Mass Driver Reaction Engine [Space]
MDS	- Multi-point Distribution Service
MDT	- Mean Down Time
MDU	- Marker Decoder Unit
MDX	- Modular Digital eXchange
ME	- Maine
ME	- Mechanical Engineer
MEA	- Minimum Enroute Altitude (IFR)
MEC	- Mobile Equipment Console
MECO	- Main Engine CutOff
MED	- Master of EDucation, "MEd"
MELD	- Mechanized Engineering and Layout for Distributing frames
MERP	- Middle-Earth Role Playing
MERS	- Most Economic Route Selection
MET	- Mid European Time
MET	- Multibutton Electronic Telephone
MF	- Medium Frequency (300-3000KHz)
MF	- Middle French
MF	- Multi-Frequency [telephony]
MFA	- Master Fine Arts
MFB	- Monochrome Frame Buffer
MFENET	- Magnetic Fusion Energy NETwork
MFG	- Manufacturing
MFJ	- Modification of Final Judgement
MFLOPS	- Million FLoating-point OPerations per Second
MFM	- Modified Frequency Modulation
MFR	- Multi-Frequency Receivers
MFS	- Macintosh File System
MFT	- Metallic Facility Terminal
MFT	- Multiprogramming with a Fixed number of Tasks
MG	- Machine Gun
MG	- Major General
MG	- MasterGroup
MG	- Military Government
MGH	- Massachusetts General Hospital
MGM	- Metro-Goldwyn Mayer [Corporate name]
MGT	- MasterGroup Translator
MHD	- MagnetoHydroDynamics
MHL	- Microprocessor Host Loader
MHS	- Message Handling System (aka X.400)
MHz	- MegaHertZ (unit of frequency, 1,000,000 cycles per second)
MI	- Michigan
MI	- Military Intelligence
MI	- Mode Indicator
MIA	- Missing In Action
MIB	- Management Information Base
MICE	- Modular Integrated Communications Environment
MICR	- Magnetic Ink Character Recognition
MIDI	- Musical Instrument Digital Interface
MIF	- Maker Interchange Format
MIFASS	- Marine Integrated Fire And Support System
MIL	- Military
MILNET	- MILitary NETwork
MILSTD	- MILitary StandarD, "MIL-STD"
MIM	- Media Interface Module
MIM	- Morality In Media
MIMD	- Multiple Instruction, Multiple Data
MIME	- Multipurpose Internet Mail Extensions
MIN	- Mobile Identification Number
MINCE	- MINCE Is Not Complete Emacs
MINX	- Multimedia Information Network eXchange
MIP	- Mortgage Insurance Premium
MIPS	- Microprocessor without Interlocked Piped Stages
MIPS	- Million Instructions Per Second
MIPS	- Million of Instructions Per Second
MIR	- Micro-Instruction Register
MIR	- Peace, "mir" [Russian]
MIRS	- Management Information Retrival System
MIRV	- Multiple Independently-Targetable Reentry Vehicle
MIS	- Management Information System
MISCF	- MISCellaneous Frame
MIT	- Massachusetts Institute of Technology
MITI	- Ministry of International Trade and Industry
MITS	- Microcomputer Interactive Test System
MJ	- Modular Jack
MKTG	- Marketing
ML	- Middle Latin
MLA	- Member of Legislative Assembly (see MPP)
MLC	- MiniLine Card
MLCD	- Multi-Line Call Detail
MLD	- Minimum Lethal Dose
MLEM	- Multi Language Environment
MLL	- Mars Logistics Lander [NASA OEXP]
MLO	- Material, Labor, Overhead - Inventoriable Cost / Full Cost
MLS	- Microwave Landing System
MLS	- MultiLevel Security
MLS	- Multiple Listing Service
MLT	- Mechanized Loop Testing
MLV	- Medium Lift Vehicle [NASA OEXP]
MM	- Maryknoll Missioners
MMC	- Minicomputer Maintenance Center
MMC	- Money Market Certificate
MMDF	- Multi-channel Memo Distribution Facility
MMES	- Martin Marietta Energy Systems
MMFS	- Manufacturing Message Format Standard
MMGT	- MultiMasterGroup Translator
MMH	- MonoMethyl Hydrazine
MMJ	- Modified Modular Jack
MMM	- see 3M
MMOC	- Minicomputer Maintenance Operations Center
MMP	- Modified Modular Plug
MMS	- Main Memory Status
MMS	- Memory Management System
MMT	- Multiple Mirror Telescope
MMU	- Manned Maneuvering Unit [Space]
MMU	- Memory Management Unit
MMW	- Multi-Mega Watt [Space]
MMX	- Mastergroup MultipleX
MN	- Minnesota
MNA	- Member of National Assembly (Quebec)
MNOS	- Metal-Nitride-Oxide Semiconductor
MNP	- Microcom Networking Protocol
MNRAS	- Monthly Notices of the Royal Astronomical Society
MO	- Magneto-Optical
MO	- Mail Order
MO	- Medical Officer
MO	- Missouri
MO	- Modus Operandi
MO	- Money Order
MOA	- Military Operations Area
MOC	- Mars Observer Camera (on Mars Observer)
MOCA	- Minimum Obstacle Clearance Altitude (IFR)
MOD	- Magneto-Optical Disk
MOD	- Mesio Occlusal Distal (dental filling)
MODEM	- MOdulator-DEModulator
MOFW	- Men Of Few Words
MOG	- Minicomputer Operations Group
MOL	- Manned Orbiting Laboratory
MOLA	- Mars Observer Laser Altimeter (on Mars Observer)
MOMV	- Manned Orbital Maneuvering Vehicle [Space]
MOP	- Maintenance Operations Protocol (DEC)
MOR	- Middle-Of-the-Road
MOS	- Metal Oxide Semiconductor
MOSFET	- Metal Oxide Semiconductor Field Effect Transistor
MOTAS	- Member of the Appropriate Sex
MOTIS	- Message-Oriented Text Interchange System
MOTOS	- Member of the Opposite Sex
MOTSS	- Member of the Same Sex
MOTV	- Manned Orbital Transfer Vehicle [Space]
MOU	- Memorandum Of Understanding
MOUSE	- Minimum Orbital Unmanned Satellite of Earth
MOV	- Metal Oxide Varistor
MP	- Manifold Pressure
MP	- Melting Point
MP	- Member of Parliament
MP	- Metal Particle
MP	- Metropolitan Police
MP	- Micro Processor
MP	- Military Police(man)
MP	- Mixed Projection
MP	- Modular Plug
MP	- MultiProcessing
MP	- MultiProcessor
MPC	- Minor Planets Circular
MPC	- Multiprocess Communications
MPCC	- Microprocessor Common Control
MPCH	- Main Parallel CHannel
MPDU	- Message Protocol Data Unit
MPE	- Mission to Planet Earth [Space]
MPG	- Miles Per Gallon
MPH	- Miles Per Hour
MPIF	- Multiprocessor Interface
MPO	- Manufacturer's Point of Origin
MPOW	- Multiple Purpose Operator Workstation
MPP	- Member of Provincial Parliament (Canada; also MLA)
MPP	- Message Posting Protocol
MPP	- Message Processing Program
MPP	- MicroProcessor Pascal
MPPD	- Multi-Purpose Peripheral Device
MPR	- Mars Pressurized Rover [Space]
MPS	- Master Production Schedule
MPS	- Megabytes Per Second
MPT	- Ministry of Posts and Telecommunications
MPT	- MultiPort Transceiver
MPU	- MicroProcessor Unit
MPV	- Mars Piloted Vehicle [NASA OEXP]
MPW	- Macintosh Programmer's Workshop
MR	- Miniatures Rules
MRD	- Marketing Requirements Document
MRF	- Maintenance Reset Function
MRFL	- Mandatory File and Record Locking
MRI	- Magnetic Resonance Imaging
MRP	- Manufacturing Requirements Planning
MRP	- Manufacturing Resource Planning
MRP	- Material Resource Planning
MRS	- Material Reject Stock
MRS	- Material Requirements Schedule
MRSR	- Mars Rover and Sample Return
MRSRM	- Mars Rover and Sample Return Mission
MRTS	- Modification Request Tracking System
MRU	- Most Recently Used
MS	- Maintenance State
MS	- ManuScript
MS	- Master of Science
MS	- Military Science
MS	- MilliSecond
MS	- Motor Ship
MS	- Multiple Sclerosis
MSB	- Most Significant Bit; Most Significant Byte
MSC	- Media Stimulated Calling
MSC	- MicroSoft C
MSCDEX	- MicroSoft CD-rom EXtensions
MSCP	- Mass Storage Control Protocol
MSD	- Most Significant Digit
MSDOS	- MicroSoft DOS, "MS-DOS", Maybe SomeDay an Operating System
MSE	- Mobile Subscriber Equipment
MSFC	- (George C.) Marshall Space Flight Center [NASA]
MSFR	- Minimum Security Functionality Requirements
MSG	- MonoSodium Glutamate
MSH	- Marvel Super Heroes
MSI	- Medium Scale Integration
MSL	- Mean Sea Level
MSL	- Motor Simulation Laboratory
MSN	- Manufacturing Sequence Number
MSN     - Manhattan Street Network, mesh architecture - wavelength-division mux
MSO	- Manufacturers Statement of Ownership
MSP	- Mass Storage Pedestal
MSPE	- Mercenaries, Spies & Private Eyes
MSR	- Multitrack Serpentine Recording
MSS	- Management Support System
MSS	- ManuScriptS
MSS	- Mass Storage Subsystem
MSS	- Mass Storage System
MSS	- Maximum Segment Size
MST	- Mountain Standard Time
MT	- Material Transfer
MT	- Metric Ton
MT	- Mountain Time
MTA	- Mail Transfer Agent
MTA	- Message Transfer Agent
MTA	- Message Transfer Architecture (AT&T)
MTA	- Metropolitan Transportation Authority
MTBF	- Mean Time Between Failures
MTBRP	- Mean-Time-Between-Parts-Replacement
MTC	- Man Tended Capability
MTD	- Month To Date
MTF	- Master Test Frame
MTF	- Modulation Transfer Function
MTI	- Multi-Terminal Interface
MTM	- Method Time Measurements
MTP	- Message Transfer Part
MTR	- Magnetic Tape Recording
MTR	- Mechanized Time Reporting
MTS	- Message Telecommunications Service
MTS	- Message Telephone Service
MTS	- Mobile Telephone Service
MTSO	- Mobile Telephone Switching Office [telephony]
MTTF	- Mean Time To Failure
MTTFF	- Mean Time To First Failure
MTTR	- Mean Time To Repair
MTTR	- Mean Time Trouble Repair
MTU	- Maintenance Termination Unit
MTU	- Maximum Transer Unit
MTU	- Maximum Transmission Unit
MTU	- Media Tech Unit
MTV	- Music TeleVision
MTX	- Mobile Telephone eXchange
MU	- Message Unit
MUA	- Mail User Agent
MUD	- Multi-User Dialog
MUD	- Multi-User Dimension
MUD	- Multi-User Dungeon
MUF	- Maximum Usable Frequency (max freq during sunspot activity)
MULDEM	- MULtiplexer-DEMultiplexer
MULTICS	- MULTiplexed Information and Computing Service
MUMPS	- Massachusetts general hospital Utility MultiProgramming System
MUNG	- Mung Until No Good (see the hacker's dictionary)
MUX	- MUltipleXor
MV	- MicroVAX
MVA	- Market Value Adjustment
MVA	- MegaVolt Ampere
MVP	- Multiline Variety Package
MVS	- Multiple Virtual Storage
MVSSP	- Multiple Virtual Storage / System Product, "MVS/SP"
MVSXA	- Multiple Virtual Storage / Extended Architecture, "MVS/XA"
MVY	- Martha's Vineyard MA
MW	- MicroWave, "M/W"
MW	- MultiWink
MWM	- Motif Window Manager
MX	- Mail eXchange
MX	- Missile eXperimental
MXU	- MultipleXer Unit
MeV	- Million Electron Volts
N	- North
N	- Notice
NA	- Narcotics Anonymous
NA	- Next Address
NA	- North America
NA	- Not Applicable
NAACP	- National Association for the Advancement of Colored People
NAAS	- North American Automated Systems co.
NAB	- National Association of Broadcasters
NABISCO	- NAtional BIScuit COmpany [Corporate name]
NAC	- Network Administration Center
NACA	- National Advisory Committee on Aeronautics (became NASA)
NACS	- National Advisory Committee on Semiconductors
NAD	- Network Access Device
NADGE	- NATO Air Defense Ground Environment
NAG	- Network Architecture Group
NAG	- Numerical Algorithms Group
NAGE	- National Association of Government Employees
NAK	- Negative AcKnowledgement
NAM	- Name and Address Module [telephony, cellular phone changeable ROM]
NAM	- National Account Manager [telephony, AT&T specific?]
NAM	- Number Assignment Module [telephony, cellular phone changeable ROM]
NAMM	- North American Music Merchants
NAND	- Inverted And Gate, Not And
NAND	- Not-AND gate
NANP	- North American Numbering Plan
NAPAP	- National Acid Precipitation Assessment Program
NAPLPS	- North American Presentation Layer Protocol Suite
NAR	- National Association of Realtors
NAR	- Nuclear Acoustic Resonance
NARDAC	- NAvy Regional Data Automation Center
NAS	- National Academy of Sciences
NAS	- National Advanced Systems
NAS	- National Aircraft (Aerospace) Standards
NAS	- National Audubon Society
NAS	- Naval Air Station
NAS	- Network Application Support
NAS	- Numerical Aerodynamic Simulation
NAS	- Numerical and Atmospheric Sciences network
NASA	- National Aeronautics and Space Administration
NASAGSFC	- National Aeronautics and Space Administration Goddard Space Flight Center, "NASA/GSFC"
NASCAR	- National Association of Stock Car Auto Racing
NASDA	- National Space Development Agency [Japan]
NASDAQ	- National Association of Security Dealers Automated Quotations
NASM	- National Air and Space Museum
NASP	- National AeroSpace Plane
NATO	- North Atlantic Treaty Organization
NAU	- Network Addressable Unit
NAVDAC	- NAVal Data Automation Command
NAVSWC	- NAV Surface Warfare/Weapons Center
NB	- New Brunswick
NB	- Nota Bene
NBA	- National Basketball Association
NBC	- National Broadcasting Company
NBFM	- NarrowBand Frequency Modulation
NBL	- Not Bloody Likely
NBO	- Network Build Out
NBO	- Network Business Opportunity
NBP	- Name Binding Protocol
NBS	- National Bureau of Standards (renamed NIST) [U.S. Government]
NBVM	- Narrow Band Voice Modulation
NC	- Network Control
NC	- No Charge
NC	- No Connection
NC	- North Carolina
NCA	- Network Control Analysis
NCAR	- National Center for Atmospheric Research
NCC	- National Computer Conference
NCC	- Network Control Center
NCCF	- Network Communications Control Facility
NCD	- Network Computing Devices
NCDC	- National Climatic Data Center
NCE	- New Catholic Edition
NCGA	- National Computer Graphics Association
NCIC	- National Cartographic Information Center
NCIC	- National Crime Information Center
NCMOS	- N-Channel (Silicon Gate Reversed) CMOS
NCO	- Non-Commissioned Officer
NCP	- Network Control Program/Protocol/Point
NCR	- National Cash Register [Corporate name]
NCS	- National Computer/Communications Systems
NCS	- Network Computing System
NCSA	- National Center for Supercomputing Applications
NCSC	- National Computer Security Center
NCSL	- National Computer Systems Laboratory (NIST)
NCTE	- Network Channel-Terminating Equipment
NCTL	- National Computer and Telecommunications Laboratory
NCV	- No Commercial Value
ND	- Network Disk (Sun)
ND	- No Date
ND	- North Dakota
NDA	- Non-Disclosure Agreement
NDB	- Non-Directional Beacon
NDCC	- Network Data Collection Center
NDDL	- Neutral Data Definition Language
NDE	- NeWS Development Environment
NDEA	- National Defense Education Act
NDI	- Network Design & Installation (Sun Service), "ND&I"
NDIS	- Network Driver Interface Specification
NDL	- Logical Network Disk
NDL	- Network Database Language
NDP	- New Democratic Party (Canada)
NDSL	- National Direct Student Loan
NDT	- Newfoundland Daylight Time
NDV	- NASP Derived Vehicle
NE	- New England
NE	- Non Exempt
NE	- North East
NEAR	- National Electronic Accounting and Reporting system
NEARNET	- New England Academic and Research network, "NEARnet"
NEB	- New English Bible
NEBS	- New Equipment-Building System
NEC	- National Electric Code
NEC	- National Electric Conference
NEC	- Nippon Electric Company [Corporate name]
NEFS	- Network extensible File System, "NeFS"
NEI	- Not Elsewhere Included
NEMA	- National Electrical Manufacturers Association
NEMP	- Nuclear ElectroMagnetic Pulse
NES	- National Energy Strategy
NES	- Not Elsewhere Specified
NESAC	- National Electronic Switching Assistance Center
NESC	- National Energy Software Center
NET	- NETwork
NET	- National Educational Television
NET	- New England Telephone
NETBIOS	- NETwork Basic Input Output System
NETBLT	- NETwork Block Transfer
NETCDF	- NETwork Common Data Format
NEWS	- Network extensible Window System
NEWS	- Networked extensible Windowing System, "NeWS"
NEWT	- NeWS Terminal, "NeWT"
NEXRAD	- NEXt generation weather RADar
NEXT	- Near-End cross-Talk
NF	- No Funds
NFC	- National Football Conference
NFFE	- National Federation of Federal Employees
NFL	- National Football League
NFPA	- National Fire Protection Association
NFR	- Not a Functional Requirement
NFS	- Network File System
NFT	- Network File Transfer
NG	- National Guard
NG	- No Good
NGC	- New General Catalog
NH	- New Hampshire
NHI	- National Health Insurance
NHL	- National Hockey League (the nation is Canada)
NHLBI	- National Heart, Lung, and Blood Institute (Bethesda, MD)
NHR	- Non Hierarchial Routing
NI	- Network Interface
NIC	- Network Information Center (ARPAnet)
NIC	- Network Interface Card
NICE	- Network Information and Control Exchange (DECNET)
NICMOS	- Near Infrared Camera / Multi Object Spectrometer (HST upgrade)
NIFTP	- (a file transfer network in the UK)
NIH	- National Institutes of Health
NIH	- Not Invented Here
NIM	- Nuclear Instrumentation Module (an electronic instr. standard)
NIMBY	- Not In My Back Yard
NIMH	- National Institute of Mental Health (Rockville, MD)
NIMS	- Near-Infrared Mapping Spectrometer (on Galileo)
NIR	- Near InfraRed
NIR	- Network Information Registry
NIS	- Network Information Service (nee YP)
NISC	- Network Information and Support Center (NYSERNet)
NISDN  - narrowband integrated-services digital network, "N_ISDN"
NISO	- National Information Standards Organization
NIST	- National Institute of Standards and Technology (formerly NBS)
NIU	- Network Interface Unit
NJ	- New Jersey
NKS	- Network Knowledge Server
NL	- National League (baseball)
NLDP	- National Launch Development Program
NLM	- National Library of Medicine
NLP	- Natural Language Processing
NLRB	- National Labor Relations Board
NLS	- Native Language Support
NLS	- Network License Server
NM	- Nautical Mile
NM	- Network Module
NM	- New Mexico
NM	- Night Message
NM	- No Mark; Not Marked
NMC	- Network Management Center
NMI	- New Model Introduction
NMI	- Non Maskable Interrupt
NMOS	- N channel Metal Oxide Semiconductor (N-MOS) (see MOS)
NMR	- Nuclear Magnetic Resonance
NMS	- Network Management Station
NNE	- North North East
NNTP	- Net News Transfer Protocol
NNTP	- Network News Transfer Protocol
NNW	- North North West
NNX	- Network Numbering eXchange
NOAA	- National Oceanic and Atmospheric Administration
NOAO	- National Optical Astronomy Observatories
NOC	- Network Operations Center
NOCS	- Network Operations Center System
NOP	- No OPeration
NORAD	- NORth American Defense command
NORDO	- No-radio
NORGEN	- Network Operations Report GENerator
NORML	- National Organization for the Reform of Marijuana Laws
NOS	- Network Operating System
NOS	- Not Otherwise Specified
NOSC	- Naval Ocean Systems Center
NOTIS	- Network Operator Trouble Information System
NP	- No Protest
NP	- Nondeterministic-Polynomial
NP	- Notary Public
NP	- Noun Phrase
NPA	- No Power Alarm
NPA	- Numbering Plan Area, or area code [Telephony]
NPC	- Non-Player Character (see PC)
NPG	- New Product Group
NPI	- New Product Introduction
NPL	- National Physical Laboratory (UK)
NPL	- Non-Procedural Language
NPN	- Negative-Positive-Negative (transistor)
NPN	- NonProtein Nitrogen
NPP	- Net Primary Productivity
NPR	- National Public Radio
NPRM	- Notice of Proposed Rulemaking
NPSI	- Network Protocol Service Interface
NPV	- Net Present Value
NQ	- No Quote
NQS	- Network Queuing System
NRA	- National Rifle Association
NRAO	- National Radio Astronomy Observatory
NRC	- National Research Council
NRC	- Nuclear Regulatory Commission
NRDC	- Natural Resource Defense Council
NRE	- Non-Recurring Engineering
NREN	- National Research and Education Network
NRL	- Naval Research Labs
NRM	- Normal Response Mode
NRO	- National Reconnaissance Office
NROFF	- New ROFF
NRZ	- Non-Return to Zero
NRZI	- Non-Return to Zero Inverted (magnetic tape, 800 bpi)
NS	- Name Server
NS	- Network Services
NS	- Neutron Star
NS	- Not Specified
NS	- Nova Scotia
NS	- Nuclear Ship
NSA	- National Security Agency [U.S. Government]
NSAP	- Network Service Access Point
NSC	- National Security Council [U.S. Government]
NSC	- Network Service Center
NSCS	- Network Service Center System
NSDSSO	- NASA Science Data Systems Standards Office
NSE	- Network Software Environment
NSEC	- Network Switching Engineering Center
NSEL	- Network Service Selector
NSEM	- Network Software Environment
NSF	- National Science Foundation [U.S. Government]
NSFNET	- National Science Foundation NETwork
NSO	- National Solar Observatory
NSP	- Network Services Protocol (DECNET)
NSPMP	- Network Switching Performance Measurement Plan
NSSDC	- National Space Science Data Center
NST	- Newfoundland Standard Time
NSTS	- National Space Transportation System [Space]
NSU	- Networking Support Utilities
NSUG	- Nihon Sun User's Group
NSW	- New South Wales (Australia)
NSWC	- Naval Surface Warfare/Weapons (obsolete) Center
NT	- Network Termination
NT	- New Testament
NT	- Newfoundland Time
NT	- Northern Telecom
NT	- Northern Territory
NTEC	- Network Technical Equipment Center
NTEU	- National Treasury Employees Union
NTF	- No Trouble Found
NTIA	- National Telecommunications and Information Agency
NTIS	- National Technical Information Service
NTN	- Neutralized Twisted Nematic
NTO	- Network Terminal Option
NTP	- Network Time Protocol
NTP	- Normal Temperature and Pressure (see STP)
NTR	- Nuclear Thermal Rocket(ry)
NTS	- Network Technical Support
NTS	- Network Test System
NTSB	- National Transportation Safety Board [U.S. Government]
NTSC	- National Television Standards Committee; Never The Same Color
NTT	- New Technology Telescope
NTT	- Nippon Telephone & Telegraph
NU	- Name Unknown
NUA	- Network User Address
NUI	- Network User Identification
NURBS	- NonUniform Rational B-Spline
NUSC	- Naval Underwater Systems Command
NV	- Nevada
NVH	- Noise, Vibration, Harshness
NVLAP	- National Validation Laboratory Program
NVRAM	- NonVolatile Random Access Memory
NW	- North West
NWA	- Northwest Airline
NWS	- National Weather Service
NWT	- North West Territories (Australia)
NXX	- NANP syntax for a three-digit string, {[2-9],[0-9],[0-9]} [Telephony]
NY	- New York
NYC	- New York City
NYNEX	- New York, New England and the unknown (X)
NYSE	- New York Stock Exchange
NYSERNET	- New York State Educational and Research Network, "NYSERNet"
NZ	- New Zealand
NZUSUGI	- New Zealand Unix System User Group, Inc.
O2	- Oxygen
OA	- Office Automation
OA	- Order Administration
OA	- Overeaters Anonymous
OACIS	- Oregon Advanced Computing InStitute
OAK	- Oakland CA
OAO	- Orbiting Astronomical Observatory
OAS	- Organization of American States
OASYS	- Office Automation SYStem
OAT	- Outside Air Temperature
OATS	- Office Automation Technology and Services
OB	- Obligatory
OBD	- Online Bugs Database (Sun)
OBE	- Order of the British Empire
OBI	- Online Book Initiative
OBO	- Or Best Offer
OBS	- Omni Bearing Selector
OBS	- Omnibearing Selector
OC	- Operator Centralization
OC	- Order of Canada
OCATE	- Oregon Center for Advanced Technology Education
OCC	- Office Communications Cabinet
OCC	- Other Common Carrier
OCDM	- Office of Civil Defense and Mobilization
OCE	- Other Common carrier channel Equipment
OCI	- Out of City Indicator
OCLC	- Online Computer Library Center (Ohio College Library Catalog)
OCLI	- Optical Coating Labs Inc.
OCO	- Object Code Only
OCR	- Optical Character Reader
OCR	- Optical Character Recognition
OCS	- Officer Candidate School
OCST	- Office of Commercial Space Transportation
OCU	- Office Channel Unit
OD	- Doctor of Optometry
OD	- Oculus Dexter (right eye)
OD	- Officer of the Day
OD	- Outer Diameter
OD	- OverDose
ODA	- Office Document Architecture
ODAC	- Operations Distribution Administration Center
ODD	- Operator Distance Dialing
ODDD	- Operator Direct Distance Dialing
ODI	- Optical Digital Image
ODIF	- Ofice Document Interchange Format
ODISS	- Optical Digital Image Storage System
ODS	- Overhead Data Stream
OE	- Old English
OE	- Order Entry
OECD	- Organization for Economic Cooperation and Development
OED	- Oxford English Dictionary
OEM	- Original Equipment Manufacturer
OEO	- Office of Economic Opportunity
OES	- Order of the Eastern Star
OEXP	- Office of Exploration [NASA]
OF	- Old French
OFM	- Order of Friars Minor
OFNPS	- Outstate Facility Network Planning System
OFS	- Order of Free State
OG	- Original Gum
OGI	- Oregon Graduate Institute
OGICSE	- Oregon Graduate Institute Computer Science and Engineering
OGT	- OutGoing Trunk
OH	- Ohio
OH	- OverHead
OHP	- OverHead Projector
OIRA	- Office of Information and Regulatory Affairs
OIU	- Office Interface Unit
OIW	- Workshop for Implementors of OSI
OJT	- On-the-Job Training
OLC	- OnLine Consulting [MIT]
OLIT	- Open Look Interface Toolkit
OLTM	- Optical Line Terminating Multiplexer, "O-LTM"
OLTP	- OnLine Transaction Processing
OLWM	- OpenLook Window Manager
OM	- Office Management
OMB	- Office of Management and Budget
OMD	- Orchestral Manouevers in the Dark
OME	- Oregon Microcomputer Engineering (Intel)
OMM	- Output Message Manual
OMPF	- Operation and Maintenance Processor Frame
OMS	- Orbital Maneuvering System
OMV	- Orbital Maneuvering Vehicle [Space]
ON	- Old Norse
ONA	- Open Network Architecture
ONAC	- Operations Network Administration Center
ONAL	- Off Network Access Line
ONC	- Open Network Computing
ONI	- Office of Naval Intelligence
ONI	- Operator Number Identification [telephony]
ONR	- Office of Naval Research
OO	- Object Oriented
OOB	- Out Of Band
OODB	- Object Oriented Data Base
OOP	- Object-Oriented Programming
OOPART	- Out Of Place ARTifact
OOPL	- Object-Oriented Programming Language
OOPS	- Object Oriented Program Support
OOPS	- Object-Oriented Programming System
OOPSTAD	- Object Oriented Programming for Smalltalk Application Developers Association
OOSH	- Object-Oriented SHell
OOT	- Object-Oriented Technology
OP	- OFFICEPOWER office automation system, trademark of CCI
OP	- Observation Post
OP	- OfficePower office automation system, trademark of CCI
OP	- Order of Preachers
OP	- Out of Print
OP	- Outside Plant
OPC	- Originating Point Codes
OPDU	- Operation Protocol Data Units
OPEC	- Organization of Petroleum Exporting Countries
OPEOS	- Outside Plant planning, Engineering & construction Operations Sys
OPF	- Orbiter Processing Facility
OPM	- Office of Personnel Management
OPM	- Outside Plant Module
OPS	- Off-Premises Station
OPSM	- Outside Plant Subscriber Module
OPX	- Off-Premises eXtension
OR	- Operating Room
OR	- Operation Research
OR	- Oregon
OR	- Originating Register
OR	- Owner's Risk, Own Risk
ORB	- Office Repeater Bay
ORDLIX	- Organized Design for Line and Crew System
ORFEUS	- Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer
ORM	- Optical Remote Module
ORNAME	- Originator / Recipient Name, "ORname"
ORNL	- Oak Ridge National Laboratory
OROM	- Optical Read Only Memory
ORT	- Ongoing Reliability Test
OS	- Oculus Sinister (left eye)
OS	- Operating System
OS	- Operator Service
OS	- Ordinary Seaman
OS	- Out of Stock
OS	- OutState
OS2	- Operating System/2, "OS/2"
OSAC	- Operator Services Assistance Center
OSB	- Order of St. Benedict
OSC	- OSCillator
OSC	- Operator Services Center
OSC	- Orbital Sciences Corporation [Space]
OSCAR	- Orbiting Satellite Carrying Amateur Radio
OSCRL	- Operating System Command Response Language
OSD	- Office of the Secretary of Defense
OSDIT	- Office of Software Development and Information Technology
OSDS	- Operating System for Distributed Switching
OSF	- Open Software Foundation (Oppose Sun Forever)
OSF	- Order of St. Francis
OSHA	- Occupational Safety and Health Act
OSI	- Open Systems Interconnection
OSINET	- Open Systems Interconnection Network
OSIRM	- Open Systems Interconnection/Reference Model, "OSI/RM"
OSME	- Open Systems Message Exchange
OSN	- Office Systems Node
OSN	- Open Systems Network
OSO	- Originating Signaling Office
OSP	- Optical Storage Processor
OSP	- OutSide Plant
OSPF	- Open Shortest Path First
OSPS	- Operator Service Position System
OSS	- Office Support System
OSS	- Office of Strategic Services (later CIA)
OSS	- Operation Support System [telephony, AT&T?]
OSS	- Operator Service System
OSSA	- Office of Space Science and Applications
OSSE	- Oriented Scintillation Spectrometer Experiment (on GRO)
OSTP	- Office of Science and Technology Policy [White House]
OT	- Old Testament
OT	- OverTime
OTA	- Office of Technology Assessment [U.S. government]
OTA	- Optical Telescope Assembly (on HST)
OTB	- Off-Track Betting
OTBS	- One True Bracketing Style
OTC	- Output Technology Corporation
OTC	- Over The Counter (stocks)
OTDR	- Optical TDR
OTEC	- Ocean Thermal Energy Conversion
OTF	- Open Token Foundation
OTHB	- Over The Horizon - Backscatter (as in radar), "OTH-B"
OTL	- Out To Lunch
OTLF	- Open Taxi & Limousine Foundation, "OT&LF"
OTM	- On Time Marker
OTOH	- On The Other Hand
OTR	- On The Rag
OTS	- Off The Shelf
OTS	- Office of Thrift Supervision
OTS	- Officers' Training School
OTV	- Orbital Transfer Vehicle [Space]
OUTWATS	- OUTward Wide Area Telephone Service [telephony]
OV	- Orbiter Vehicle [Space]
OW	- Over-Write
OWHN	- One-Word Host Name
P	- (Chem.) para-, "p-"
P	- (UK) pence, pennies, penny, "p"
P	- page, "p."
P	- per (as in m.p.h.), "p."
P	- peta- (SI prefix)
P	- phosphorus, "P"
P	- pico- (SI prefix), "p"
P2	- Interpersonal Messaging Protocol (for heading and body)
P3	- Protocol used by UA Entities and MTA Entities
P4	- The video interface bus on the 3/80
PA	- Pennsylvania
PA	- Per Annum
PA	- Play Aid
PA	- Power Alarm
PA	- Power of Attorney
PA	- Precision Architecture (HP)
PA	- Press Agent
PA	- Private Account
PA	- Process Alert
PA	- Program Address
PA	- Public Address
PA	- Purchasing Agent
PA	- protactinium, "Pa"
PABX	- Private Automatic Branch eXchange [telephony]
PACE	- Program for Arrangement of Cables and Equipment
PACT	- Prefix Access Code Translator
PACX	- Private Automatic Computer eXchange
PAD	- Packet Assembler-Disassembler (for networking)
PAD	- Public Access Device (networking)
PAK	- Product Authorization Key
PAL	- Personal Answer Line (Sun group)
PAL	- Phase Alternation Line-rate
PAL	- Programmable Array Logic
PAM	- Payload Assist Module [Space]
PAM	- Pulse Amplification Modulation
PAM	- Pulse-Amplitude Modulation
PAMD	- Payload Assist Module, Delta-class, "PAM-D"
PAN	- Personal Account Number
PANS	- Pretty Advanced New Stuff
PAO	- Palo Alto CA
PAP	- Printer Access Protocol
PAR	- Peak-to-Average Ratio, "P/AR"
PAR	- Precision Approach Radar
PAR	- Project Authorization Request
PARC	- Palo Alto Research Center, xerox
PAS	- Public Announcement Service
PAT	- Power Alarm Test
PAT	- Profit After Tax
PATROL	- Program for Administrative Traffic Reports On Line
PAX	- Private Automatic eXchange
PBC	- Peripheral Bus Computer
PBC	- Processor Bus Controller
PBD	- Pacific Bell Directory
PBM	- Play By Mail game
PBS	- Public Broadcasting System
PBT	- Profit Before TAX
PBX	- Private Branch eXchange [telephony]
PC	- Peace Corps
PC	- PerCent; PerCentage
PC	- Personal Computer
PC	- Piece of Crap
PC	- Player Character (see NPC)
PC	- Politically Correct
PC	- Post Card
PC	- Post Cibum (after meals)
PC	- Primary Center
PC	- Printed Circuit
PC	- Privileged Character
PC	- Privy Council
PC	- Production Control
PC	- Program Counter
PC	- Progressive Conservative party (Canada)
PCA	- Positive Controlled Airspace (above 18,000')
PCA	- Printed-Circuit Assembly
PCAT	- Personal Computer/Advanced Technology, "PC/AT"
PCB	- PolyChlorinated Biphenyls
PCB	- Printed Circuit Board
PCB	- Process Control Block
PCB	- Protocol Control Block (TCP)
PCC	- Portable C Compiler
PCDA	- Program Controlled Data Acquisition
PCDOS	- Personal Computer DOS, "PC-DOS"
PCF	- Portable Compiled Font
PCH	- Parallel CHannel
PCI	- Panel Call Indicator
PCI	- Protocol Control Information
PCIE	- President's Council on Integrity and Efficiency
PCL	- Printer Command Language
PCL	- Programmable Command Language
PCM	- Plug-Compatible Mainframe
PCM	- Pulse-Code Modulation
PCN     - Personal Communication Network
PCNFS	- Personal Computer Network File System
PCO	- Peg Count and Overflow
PCO	- Process Change Order
PCPC	- Personal Computers Peripheral Corporation
PCS	- Patchable Control Store
PCS	- Permanent Change of Station
PCSA	- Personal Computer Systems Architecture
PCTE	- Portable Common Tools Environment
PCTS	- Posix Conformance Test Suite
PCTV	- Program Controlled TransVerters
PD	- Per Diem
PD	- Peripheral Decoder
PD	- Police Department
PD	- Potential Difference
PD	- Public Domain
PDAD	- Proposed Draft ADdendum
PDE	- Partial Differential Equation
PDES	- Product Data Exchange Specifications
PDF	- Power Distribution Frame
PDF	- Program Development Facility
PDI	- Power and Data Interface
PDL	- Page Description Language
PDL	- Page/Program Description/Design Language
PDL	- Program Design Language
PDN	- Public Data Network
PDP	- Plasma Display Panel
PDP	- Programmed Data Processor [DEC]
PDQ	- Pretty Damned Quick
PDS	- Portable Display Shell
PDS	- Premises Distribution System (AT&T)
PDS	- Public Domain Software
PDSP	- Peripheral Data Storage Processor
PDT	- Pacific Daylight Time
PDU	- Product Development Unit
PDU	- Protocol Data Unit
PE	- Peripheral Equipment
PE	- Phase Encoded (1600 bpi)
PE	- Physical Education
PE	- PolyEthylene
PE	- Prince Edward island
PE	- Printer's Error
PE	- Professional Engineer
PE	- Protestant Episcopal
PECC	- Product Engineering Control Center
PEI	- Prince Edward Island
PEM	- Privacy Enhanced Mail
PEP	- Packetized Ensemble Protocol
PEP	- Productivity Enhancement Project
PEPE	- Pepe Est Presque Emacs
PERFECT	- PERFormance Evaluation for Cost-Effective Transformations
PERL	- Pathologically Eclectic Rubbish Lister
PERL	- Practical Extraction and Report Language
PERT	- Program Evalution and Review Technique
PETA	- People for the Ethical Treatment of Animals
PEX	- Phigs/phigs+ Extension to X
PEXSI	- PEX Sample Implementation (gfx), "PEX-SI"
PF	- Programmed Function
PFB	- Printer Font Binary
PFPU	- Processor Frame Power Unit
PFVO	- Pointer to a Function returning a Void and taking an Object
PG	- Perge Notice
PGA	- Pin Grid Array
PGA	- Professional Graphics Adapter
PGA	- Pure Grain Alcohol
PGP	- Pretty Good Privacy
PH	- Parity High bit
PH	- Potential of Hydrogen, "pH"
PH	- Process Hold
PHA	- Pulse Height Analyzer/Analysis
PHD	- PHilosophiae Doctor/Doctor of PHilosophy
PHIGS	- Programmer's Hierarchical Interactive Graphics System
PHOTOCD	- PHOTOgraphic Compact Disk
PHS	- Public Health Service
PHYSREV	- Physical Review Journal, "PhysRev"
PI	- Principal Investigator
PI	- Protocol Interpreter
PIA	- Plug-In Administrator
PIC	- Pilot In Command
PIC	- Plastic-Insulated Cable
PIC	- Primary Independent Carrier
PICS	- Plug-in Inventory Control System (PICS/DCPR)
PID	- Process IDentifier
PID	- Protocol IDentifier
PIF	- Paid In Full
PIMS	- Profit Impact of Marketing Strategy
PIN	- Personal Identification Number
PINE	- Pine Is Not Elm
PING	- Packet INternet Groper
PING	- Packet InterNet Grouper
PIP	- Packet Interface Port
PIP	- Periphal Interchange Program
PIT	- Principal, Interest, and Taxes
PITI	- Principal, Interest, Taxes, Insurance
PIXEL	- PIcture ELement
PL	- Parity Low bit
PL1	- Programming Language One, "PL/1"
PLA	- Programmable Logic Array
PLAN	- Public Lands Action Network
PLC	- Programmable Logic Controller
PLCC	- Plastic Leaded Chip Carrier
PLD	- Programmable Logic Device
PLL	- Phase-Locked Loop
PLM	- Programming Language for Microcomputers
PLO	- Palestine Liberation Organization
PLO	- Please Leave On
PLS	- Physical Layer Signaling
PLSS	- Portable Life Support System
PLT	- Panduit Locking Tie
PM	- PayMaster
PM	- Peripheral Module
PM	- Phase Modulation
PM	- Plant Management
PM	- Police Magistrate
PM	- Post Meridiem (after noon)
PM	- PostMaster
PM	- PostMortem
PM	- Presentation Manager
PM	- Pressurized Module
PM	- Preventive Maintenance
PM	- Prime Minister
PM	- Provost Marshal
PMA	- Physical Medium Attachment
PMAC	- Peripheral Module Access Controller
PMC	- Permanently Manned Capability
PMDF	- Pascal Memo Distribution Facility
PMEG	- Page Map Entry Group
PMG	- Page Map Group
PMIRR	- Pressure Modulated InfraRed Radiometer (on Mars Observer)
PMO	- Prime Minister's Office
PMOS	- P channel Metal Oxide Semiconductor (P-MOS) (see MOS)
PMRC	- Parents' Music Resource Center
PMT	- PhotoMultiplier Tube
PMU	- Precision Measurement Unit
PMX	- Presentation Manager for the X window system, "PM/X"
PN	- Part Number
PN	- Promissory Note
PNB	- Pacific Northwest Bell
PNP	- Plug N Play
PNP	- Positive-Negative-Positive (transistor)
PNPN	- Positive-Negative-Positive-Negative devices
PO	- Petty Officer
PO	- Post Office
PO	- Postal Order
PO	- Purchase Order
POB	- Periphal Order Buffer
POC	- Port Of Call
POD	- Pay On Delivery
POD	- Point Of Distribution
POE	- Port Of Entry/Embarkation
POF	- Programmable Operator Facility
POGO	- Polar Orbiting Geophysical Observatory
POH	- Pilot's Operating Handbook
POK	- Power on Okey Signal
POM	- Phase Of Moon
POP	- Point Of Production
POP	- Point of Presence [telephony]
POP	- Post Office Protocol
POP	- Processor On Plug-in (h/w)
POPS	- Paperless Order Processing System
POR	- Point Of Receive
POR	- Price On Request
POS	- Point Of Sale
POSI	- Promoting conference for OSI
POSIX	- Portable Operating System for unIX
POSYBL	- PrOgramming SYstem for distriButed appLications
POTS	- Plain Old Telephone Service
POTS	- Plain Ordinary Telephone System
POTV	- Personnel Orbit Transfer Vehicle [Space]
POV	- Point Of View
POW	- Prisoner Of War
POWER	- Performance Optimization With Enhanced Risc
PP	- Painting Processor
PP	- Parcel Post
PP	- Past Participle
PP	- Post Pay
PP	- Primary Point
PP	- Private Pilot
PP	- pages, "pp."
PPA	- Post Pack Audit
PPB	- Parts Per Billion
PPBS	- Planning, Programming, and Budgeting Systems
PPC	- Pour Prendre Conge' (to take leave)
PPCS	- Person to Person, Collect, Special [telephony]
PPD	- Peripheral Pulse Distributor
PPD	- PostScript Printer Description
PPI	- Professional Press Inc.
PPM	- Page Per Minute
PPM	- Parts Per Million
PPM	- Product Portfolio Management
PPN	- Parameterized Post-Newtonian formalism for general relativity
PPN	- Project Programmer Number
PPN	- Public Packet Switching
PPP	- Point-to-Point Protocol
PPS	- PostPostScriptum
PPS	- Product Performance Surveys
PPS	- Public Packet Switching network
PPT	- Parts Per Trillion
PPT	- Pulse Pair Timing
PPT	- Punched Paper Tape
PQ	- Province of Quebec
PR	- PayRoll
PR	- Public Relations
PR	- Puerto Rico
PRC	- People's Republic of China
PRC	- Planning Research Corporation
PRCA	- Puerto Rico Communications Authority
PREMIS	- PREMises Information System
PREPNET	- Pennsylvania Research & Economic Partnership network, "PREPnet"
PRG	- PAL/PROM Programming Department
PRI	- Primary Rate Interface
PRISM	- Parallel Reduced Instruction Set Multiprocessing
PRMD	- Private Management Domain
PROFS	- PRofessional OFfice System
PROLOG	- PROgramming in LOGic
PROM	- Programmable Read-Only Memory
PROMATS	- PROgrammable Magnetic Tape System
PROPAL	- Programmed PAL
PROTEL	- PRocedure Oriented Type Enforcing Language
PRS	- Personal Response System
PRTC	- Puerto Rico Telephone Company
PS	- PicoSecond
PS	- PostScript [Adobe (tm)]
PS	- PostScriptum
PS	- Power Steering
PS	- Power Supply
PS	- Process Stop Ship
PS	- Program Store
PS	- Public School
PSA	- Problem Statement Analyzer
PSAP	- Public Safety Answering Point
PSC	- Pittsburgh Supercomputer Center
PSC	- Polar Stratospheric Clouds
PSC	- Prime Service Contractor
PSC	- Public Safety Calling system
PSC	- Public Service Commission
PSDC	- Public Switched Digital Capability
PSDN	- Packet-Switched Data Network
PSDS	- Public Switched Digital Service
PSDS	- Public Switched Digital Service [telephony, AT&T?]
PSE	- Packet Switch Exchange
PSE	- Programming Support Environment
PSF	- Point Spread Function
PSG	- Platoon SerGeant
PSG	- Professional Service Group (Sun group)
PSI	- Packet Switch Interface
PSIU	- Packet Switch Interface Unit
PSK	- Phase-Shift Keying
PSL	- Problem Statement Language
PSM	- Packet Service Module
PSM	- Position Switching Module
PSM	- Professional Service Manager
PSN	- Packet Switch Node
PSN	- Packet Switched Network
PSN	- Packet Switching Node
PSO	- Pending Service Order
PSP	- Product Support Plan
PSR	- Product Specific Realizations
PSR	- Product Specific Release
PSR	- PulSaR
PSS	- Packet Switch Stream
PSS	- Packet Switched Services
PST	- Pacific Standard Time
PSTN	- Public Switched Telephone Network
PSU	- Program Storage Unit
PSW	- Program Status Word
PSWM	- PostScript Window Manager
PT	- Pacific Time
PT	- Patrol Torpedo (as in PT boat)
PT	- Physical Therapy
PT	- Physical Training
PT	- Program Timer
PTA	- Parent-Teacher Association
PTAT	- Private Trans Atlantic Telecommunications
PTD	- Parallel Transfer Disk/Drive
PTE	- Page Table Entry
PTI	- Portable Test Instrument
PTN	- Plant Test Number [telephony:actual number assigned for 800 service]
PTO	- Patent and Trademark Office
PTO	- Please Turn Over
PTO	- Power Take-Off
PTP	- Point To Point
PTSD	- Post Traumatic-Stress Disorder
PTT	- Post, Telephone and Telegraph administration
PTT	- Postal, Telephone, and Telegraph administration
PTV	- Passenger Transport Vehicle [Space]
PTW	- Primary Translation Word
PU	- Physical Unit
PUC	- Peripheral Unit Controller
PUC	- Public Utilities Commission
PUD	- Planned Unit Development
PUP	- PARC Universal Packet protocol
PV	- PhotoVoltaic
PVC	- Permanent Virtual Circuits
PVC	- PolyVinylChloride
PVN	- Private Virtual Network
PVO	- Pioneer Venus Orbiter
PVT	- Private (pilot certificate)
PW	- Prisoner of War (usually POW)
PWB	- Printed Wiring Board
PWB	- Programmers Work Bench
PWD	- Print Working Directory
PWG	- Permanent Working Group
PX	- Post eXchange (see also BX)
Pa	- Pascal
Q	- Queen('s), "Q."
Q	- question, "Q."
QA	- Quality Assurance
QAM	- Quadrature Amplitude Modulation
QAS	- Quasi-Associated Signaling
QB	- queen's bishop (chess)
QBP	- queen's bishop's pawn (chess)
QC	- Quality Control
QC	- Queen's Counsel
QD	- Quaque Die (daily)
QDA	- Quantity Discount Agreement
QDCS	- Quality, Deliverly, Cost, Service / Safety
QE	- Quick Estimation
QED	- Quantum ElectroDynamics
QED	- Quod Erat Demonstrandum (which was to be demonstrated)
QEF	- Quod Erat Faciendum (which was to be done)
QEI	- Quod Erat Inveniendum (which was to be found out)
QET	- Quantum Effect Transistor
QIC	- Quarter-Inch Cartridge
QID	- Quater In Die (four times a day)
QIS	- Quality Information System
QKt	- queen's knight (chess)
QKtP	- queen's knights's pawn (chess)
QLI	- Query Language Interpreter
QM	- QuarterMaster
QMC	- QuarterMaster Corps
QMF	- Query Management Facility
QMG	- QuarterMaster General
QMP	- Quality Measurement Plan
QMS	- Quality Micro Systems
QNS	- Quantity Not Sufficient
QQV	- which see (plural of q.v.), "qq.v."
QRA	- Quality Reliability Assurance
QRSS	- Quasi Random Signal Source
QSO	- Quasi-Stellar Object
QSS	- Quality Surveillance System
QTC	- Quantitative Technology Corporation
QTY	- Quantity
QUANGO	- QUAsi Non-Governmental Organization
QUANTAS	- QUeensland And Northern Territory Aerial Service, "Quantas"
QUANTAS	- Quantas Empire Airways
QUEL	- QUEry Language
QV	- which see (sing.), "q.v."
QWERTY	- first six keys from left on top alphabetic row of standard keyboard
QWL	- Quality of Working Life
R	- Republican, "R."
R	- Ring
R	- Rolemaster
R	- rand
R	- recto, "r."
R	- right, "r"
R	- roentgen
R	- rook in chess
RA	- Regular Army
RA	- Research Assistant
RA	- Return Authorization
RA	- Royal Academy
RA	- radium, "Ra"
RAAF	- Royal Australian Air Force
RACE	- Random Access Card Equipment
RACEP	- Random Access and Correlation for Extended Performance 
RAD	- Radiation Absorbed Dose
RAD	- Rapid Access Disk
RADAR	- RAdio Detection And Ranging
RADAR	- Radio Association Defending Airwave Rights (radar detector makers)
RADM	- Rear ADMiral
RAF	- Royal Air Force
RAID	- Redundant Arrays of Inexpensive Disks
RAM	- Random-Access Memory
RAMP	- Ratings And Maintenance Phase
RAND	- Rural Area Network Design
RAO	- Regional Accounting Office
RAO	- Revenue Accounting Office
RAR	- Return Address Register
RARDE	- Royal Armaments Research and Development Establishment
RARE	- European Association of Research Networks
RARE	- Reseaux Associes pour la Recherche Europeenne
RARP	- Reverse Address Resolution Protocol (Ethernet->Internet)
RAS	- Reliability, Availability, and Serviceability
RASC	- Residence Account Service Center
RATFOR	- RATional FORtran
RB	- Rhythm and Blues, "R&B"
RBC	- Red Blood Count
RBHC	- Regional Bell Holding Company
RBI	- Runs Batted In
RBOC	- Regional Bell Operating Company
RBOR	- Request Basic Output Report
RBT	- Reliable Broadcast Toolkit
RBTL	- Read Between The Lines
RC	- Receive Clock
RC	- Red Cross
RC	- Regional Center
RC	- Repair Center (Sun)
RC	- Resistance-Capacitance
RC	- Resistor-Capacitor circuit (as in filters)
RC	- Roman Catholic
RCA	- Radio Corporation of America
RCAF	- Royal Canadian Air Force
RCAS	- Reserve Component Automation System
RCC	- Radio Common Carrier
RCC	- Remote Cluster Controller
RCC	- Reverse Command Channel
RCF	- Remote Call Forwarding
RCI	- Rodent Cage Interface (for SLS mission)
RCL	- Runtime Control Library 
RCLDN	- Retrieval of Calling Line Directory Number
RCM	- Remote Carrier Module
RCMAC	- Recent Change Memory Administration Center
RCMP	- Royal Canadian Mounted Police
RCP	- Remote CoPy
RCS	- Reaction Control System
RCS	- Revision Control System
RCSC	- Remote Spooling Communications Subsystem
RCU	- Radio Channel Unit
RCVR	- ReCeiVeR
RD	- Received Data
RD	- Research and Development, "R&D"
RD	- Rural Delivery
RDA	- Remote Data Access
RDBMS	- Relational DataBase Management System
RDES	- Remote Data Entry System
RDF	- Radio Direction Finding
RDL	- Remote Digital Loopback
RDM	- Reliably-Delivered Message (sockets)
RDP	- Reliable Datagram Protocol
RDS	- Radio Digital System
RDT	- Radio Digital Terminal
REA	- Rail Express Agency
REC	- Regional Engineering Center
RECON	- Reconnaissance
REGIS	- REmote Graphics Instruction Set
REM	- Rapid Eye Movement
REM	- Rat Enclosure Module (for SLS mission)
REM	- Rational Economic Man
REM	- Remote Equipment Module
REM	- Ring Error Monitor
REM	- Roentgen Equivalent in Man
REMOBS	- REMote OBservation System
REN	- Ring Equivalence Number
REO	- R. E. Olds
REO	- Removable, Erasable, Optical
REQSPEC	- REQuirements SPECification
RETMA	- Radio Electronics Television Manufacturers Association (rack spacing)
REX	- Remote EXecution
REXX	- Restructured EXtended eXecutor
RF	- Radio Frequency
RFC	- Request For Comments [Internet]
RFD	- Rural Free Delivery
RFE	- Request For Enhancement
RFI	- Radio Frequency Interference
RFP	- Request For Proposals
RFQ	- Request For Quotes
RFS	- Remote File Sharing
RFS	- Remote File System
RFT	- Request For Technology
RGB	- Red Green Blue
RGBI	- Red Green Blue Intensity
RGP	- Raster Graphics Processor
RGU	- Radio Government/Universal, "RG/U"
RH	- Right Hand
RHC	- Regional (Bell) Holding Company
RHS	- Right Hand Side
RHV	- Reid-Hillview Intergalactic, San Jose CA
RI	- Receiving & Inspection, "R&I"
RI	- Rhode Island
RI	- Ring Indicator
RIACS	- Research Institute for Advanced Computer Science (at NASA Ames)
RIAS	- Radio In the American Sector, berlin
RID	- Remote Isolation Device
RIF	- Reading Is Fundamental
RIF	- Reduction In Force
RIFF	- Resource Interchange File Format
RILM	- Repertoire International de Literature Musicale
RIP	- Raster Image Processor
RIP	- Rest In Peace/Requiescat In Pace
RIP	- Routing Information Protocol
RIPE	- Reseaux IP Europeenne
RIPS	- Raster Image Processing Systems Corp.
RISC	- Reduced Instruction Set Computer
RISC	- Relegate Important Stuff to the Compiler
RISLU	- Remote Integrated Services Line Unit
RIT	- Rochester Institute of Technology
RITA	- Recognition of Information Technology Achievement award
RJE	- Remote Job Entry [IBM]
RLC	- Resistor Inductor Capacitor
RLCM	- Remote Line Concentrating Module
RLDS	- The Re-organized Church of Latter-Day Saints
RLG	- Research Libraries Group
RLIN	- Research Libraries Information Network [run by RLG (q.v.)]
RLL	- Run Length Limited
RLOGIN	- Remote Login, "rlogin"
RLT	- Remote Line Test
RM	- Record Marking
RM	- Regional Manager
RMA	- Return Materials Authorization
RMAS	- Remote Memory Administration System
RMATS	- Remote Maintenance Admisistration and Traffic System [telephony]
RMF	- Read Me First
RMI	- Radio Magnetic Indicator
RMR	- Remote Message Registers
RMR	- Return Material Receipt
RMS	- Remote Manipulator System [Space]
RMS	- Richard M. Stallman
RMS	- Root Mean Square
RMS	- Royal Mail Ship
RN	- Reference Noise
RN	- Registered Nurse
RN	- Royal Navy
RNA	- RiboNucleic Acid
RNGC	- Revised New General Catalog
RNOC	- Regional Network Operations Center
RNR	- Receive Not Ready
RNZAF	- Royal New Zealand Air Force
RO	- Read/Only, "R/O"
RO	- Receive Only
ROA	- Return On Assets
ROB	- Remote Order Buffer
ROC	- Regional Operating Company
ROE	- Rate Of Exchange
ROE	- Return On Equity
ROFF	- Run-OFF
ROG	- Receipt Of Goods
ROH	- Receiver Off Hook
ROI	- Region Of Interest
ROI	- Return On Investment
ROM	- Range Of Motion (medical)
ROM	- Read-Only Memory
ROM	- Rupture Of Membrane (as in birth)
RONA	- Return on Net Assets
RONABIT	- Return On Asset Before Income Tax
ROSAT	- ROentgen SATellite
ROSE	- Remote Operations Service Element
ROTC	- Reserve Officers' Training Corps
ROTL	- Remote Office Test Line
ROTS	- Rotary Out Trunks Selectors
ROUS	- Rodents Of Unusual Size
ROW	- Rest Of the World
ROYGBIV	- Red, Orange, Yellow, Green, Blue, Indigo, Violet, "Roy G. Biv"
RP	- Rolling Plan
RPC	- Remote Procedure Call
RPG	- RePort Generator
RPG	- Role Playing Game
RPI	- Rensselaer Polytechnic Institute
RPI	- Rolling Plan Indices
RPM	- Remote Process Management
RPM	- Removable Peripheral Module
RPM	- Resales Price Maintenance
RPM	- Revolutions Per Minute
RPN	- Reverse Polish Notation
RPO	- Railway Post Office
RPS	- Revolutions Per Second
RPS	- Rotational Positional Sensing (disks)
RPV	- Remotely Piloted Vehicle
RQ	- RuneQuest
RQS	- Rate/Quote System
RQSM	- Regional Quality Service Management
RR	- RailRoad
RR	- Rate & Route, "R&R"
RR	- Receive Ready
RR	- Resource Record
RR	- Route Relay
RR	- Rural Route
RRIP	- Rock Ridge Interchange Protocol
RRO	- Rate and Route Operator [telephony]
RRO	- Reports Receiving Office
RS	- Recommended Standard
RS	- Recording Secretary
RS	- Revised Status
RS	- Right Side
RS	- Royal Society
RS232	- Digital Communication Standard, "RS-232"
RSA	- Repair Service Attendant
RSA	- Rivest, Shamir, and Adleman
RSB	- Repair Service Bureau
RSC	- Remote Switching Center
RSC	- Residence Service Center
RSCS	- Remote Source Control System
RSCS	- Remote Spooling and Communication Subsystem
RSE	- Research & Systems Engineering, "R&SE"
RSFSR	- Russian Soviet Federated Socialist Republic
RSH	- Remote/Restricted SHell
RSLE	- Remote Subscriber Line Equipment
RSLM	- Remote Subscriber Line Module
RSM	- Remote Switching Module
RSN	- Real Soon Now
RSS	- Remote Switching System
RSTS	- Resource System Time Sharing
RSTSE	- Resource System Time Sharing/Enhanced, "RSTS/E"
RSU	- Remote Switching Unit
RSV	- Revised Standard Edition
RSVP	- Repondez S'il Vous Plait (please reply)
RSWC	- Right Side up With Care
RT	- RadioTelephone
RT	- RealTime
RT	- Risc Technology [IBM]
RTA	- Remote Trunk Arrangement
RTAC	- Regional Technical Assistance Center [telephony]
RTC	- Right To Copy
RTF	- Read This First
RTF	- Rich Text Format
RTFM	- Read The F***ing Manual
RTFSA	- Read The F***ing Stock Answers
RTG	- Radioisotope Thermoelectric Generator
RTL	- Resistor-Transistor Logic
RTLS	- Return To Launch Site (Shuttle abort plan)
RTM	- Regional Telecommunications Management
RTM	- Remote Test Module
RTMP	- Routing Table Maintenance Protocol
RTR	- Reel-To-Reel
RTS	- Ready To Send
RTS	- Real Time Systems (lll-csrg)
RTS	- Reliable Transfer Service
RTS	- Remote Testing System
RTS	- Return To Stock
RTSE	- Reliable Transfer Service Element
RTSL	- Read The Source Luke
RTT	- Round Trip Time
RTTY	- Radio Teletype
RTU	- Real Time Unix
RTU	- Remote Trunking Unit
RTU	- Right To Use
RU	- Receive Unit
RUM	- Remote User Multiplex
RV	- Recreational Vehicle
RW	- Read/Write
RW	- Read/Write, "R/W"
RW	- Right Worshipful
RW	- Right Worthy
RWC	- Remote Work Center
RWE	- Remote Wall Enclosure
RWM	- Read/Write Memory, "R/WM"
RX	- Remote eXchange
S	- Siemens
S	- Sleeve
S	- South
S	- Supplement
S	- second (SI abbrev.), "s"
S	- sulphur
SA	- Salvation Army
SA	- Seaman Apprentice
SA	- Service Assistant
SA	- Sex Appeal
SA	- Sine Anno (without date)
SA	- South Africa
SA	- South America
SA	- South Australia
SA	- Subject to Approval
SAA	- South Atlantic Anomaly
SAA	- Systems Application Architecture (IBM)
SAAB	- Svenska Aeroplan AktieBolaget (Swedish Aircraft Corporation)
SABME	- Set Asynchronous Balanced Mode Extended
SABRE	- Semi-Automated Business Research Environment
SAC	- Service Area Code
SAC	- Strategic Air Command [US military]
SACK	- Selective ACK
SADD	- Students Against Drunk Driving
SAE	- Society of Automotive Engineers
SAG	- Street Address Guide
SAGA	- Solar Array Gain Augmentation (for HST)
SAI	- Serving Area Interface
SAIC	- Science Applications International Corporation
SAKDC	- Swiss Army Knife Data Compression
SALI	- Standalone Automatic Location Identification
SALT	- Strategic Arms Limitting Talks
SAM	- Surface-to-Air Missile
SAMA	- Step-by-step Automatic Message Accounting [telephony]
SAMPEX	- Solar Anomalous and Magnetospheric Particle EXplorer
SAMTO	- Space And Missile Test Organization
SAO	- Smithsonian Astrophysical Observatory
SAP	- Second Audio Program
SAP	- Service Access Point
SAR	- Search And Rescue
SAR	- Store Address Register
SAR	- Synthetic Aperture Radar
SARA	- Satellite pour Astronomie Radio Amateur
SAREX	- Search and Rescue Exercise
SAREX	- Shuttle Amateur Radio Experiment
SARTS	- Switched Access Remote Test System
SAS	- Southern All Stars
SAS	- Space Activity Suit
SAS	- Space Adaptation Syndrome
SAS	- Statistical Analysis Software?
SASE	- Self-Addressed Stamped Envelope
SASE	- Specific Application Service Element
SASI	- Shugart Associates Systems Interface
SAT	- Satellite [Space]
SAT	- Scholastic Aptitude Test
SAT	- Special Access Termination
SAT	- Supervisory Audio Tone
SAT	- Synthetic Aperture Telescope
SAW	- Surface Acoustic Wave
SBA	- Small Business Administration
SBC	- Single Board Computer
SBMS	- Southwestern Bell Mobile Service
SBS	- Skyline Business Systems
SBU	- Strategic Business Unit
SBUS	- School Bus, "S-Bus"
SBWR	- Simplified Boiling Water Reactor
SC	- Scanner Controller
SC	- Secondary Channel
SC	- Sectional Center
SC	- Skull & Crossbones, "S&C"
SC	- South Carolina
SC	- SpaceCraft, "S/C"
SC	- SubCommittee
SCA	- Shuttle Carrier Aircraft
SCA	- Sunlink Channel Adapter
SCAD	- Subsonic Cruise Armed Decoy
SCADA	- Supervisory Control And Data Acquisition
SCADC	- Standard Central Air Data Computer
SCAME	- SCreen oriented Anti-Misery Editor
SCAMP	- Single-Chip A-series Mainframe Processor
SCAN	- Switched Circuit Automatic Network
SCAT	- Stromberg-Carlson Assistance Team
SCB	- System Control Block
SCC	- Serial Communication Controller
SCC	- Specialized Common Carrier
SCC	- Student Center Committee [MIT]
SCC	- Switching Control Center (or Specialized Common Carriers) 
SCCA	- Sports Car Club of America
SCCS	- Source Code Control System
SCCS	- Specialized Common Carrier Service
SCCS	- Switching Control Center System
SCE	- Signal Conversion Equipment
SCE	- Structure Chart Editor
SCED	- SCSI/Ethernet/Diagnostics (Sequent board)
SCF	- Selective Call Forwarding
SCI	- SpaceCraft Incorporated
SCIFI	- SCIence FIction, "sci-fi"
SCM	- Software Configuration Management
SCM	- Subscriber Carrier Module
SCMS	- Serial Copy Management System
SCO	- Santa Cruz Operation
SCO	- Serving Central Office
SCOOPS	- SCheme Object Oriented Programming System
SCOT	- Stepper Central Office Tester
SCOTS	- Surveilance and Control Of Transmission Systems
SCP	- Signal Control Point
SCP	- Signal Conversion Point
SCP	- Sunlink Communications Processor
SCP	- System Control Program
SCPC	- Signal Channel Per Carrier
SCPD	- Supplementary Central Pulse Distributor
SCRAM	- Static Column RAM (h/w)
SCS	- Silicon Controlled Switch
SCSA	- Sun Common SCSI Architecture 
SCSI	- Small Computer System Interface (pronounced scuzzi)
SCT	- Schmidt-Cassegrain Telescope
SCTS	- Secondary Clear To Send
SCU	- Selector Control Unit
SCUBA	- Self Contained Underwater Breathing Apparatus
SCUD	- Subsonic Cruise Unarmed Decoy
SCX	- Specialized Communications eXchange
SD	- SCSI Disk
SD	- South Dakota
SDA	- Send Data With Immediated Ackonwledge
SDB	- Safety Deposit Box
SDCD	- Secondary Data Carrier Detect
SDD	- Specific Development & Design, "SD&D"
SDF	- Secondary Distribution Frame
SDF	- SubDistribution Frame
SDH     - synchronous digital hierarchy (synchronous multiplexed network)
SDI	- Selective Dissemination of Information
SDI	- Space Defense Initiative
SDI	- Standard Disk Interconnect
SDI	- Standard Disk Interface
SDI	- Storage Device Interconnect
SDI	- Strategic Defense Initiative [US Government]
SDIO	- Strategic Defense Initiative Organization
SDIS	- Switched Digital Integrated Service
SDL	- Specification and Description Language
SDL	- System Design Language
SDLC	- Synchronous Data Link Control [IBM]
SDM	- Sub-rate Data Multiplexer
SDN	- Software-Defined Network
SDO	- Staff Duty Officer 
SDOC	- Selective Dynamic Overload Controls
SDP	- Service Delivery Point
SDR	- Store Data Register
SDRC	- Structural Dynamics Research Corporation
SDS	- Switched Data Service
SDS	- Synchronous Data Set
SDSC	- San Diego Supercomputer Center
SDSC	- Synchronous Data Set Controller
SDU	- Service Data Unit
SDV	- Shuttle Derived Vehicle [Space]
SE	- South East
SE	- Systems Engineer
SEAP	- Service Element Access Point
SEAS	- Signaling Engineering and Administration System
SEATO	- SouthEast Asia Treaty Organization
SEC	- Securities and Exchange Commission
SEC	- Security Exchange Commission
SECAM	- SEquential Couleur Avec Memoire
SECNAV	- SECretary of the NAVy
SED	- Stream EDitor
SEI	- Software Engineering Institute (Carnegie Mellon)
SEI	- Space Exploration Initiative
SEL	- SELector
SEL	- Software Engineering Laboratory
SELV	- Safety Extra-Low Voltage
SEM	- Scanning Electron Microscope
SER	- Satellite Equipment Room
SERC	- Science & Engineering Research Council
SERC	- Swedish Energy Research Commission
SES	- Service Evaluation System
SESRA	- Seattle Employee Services Recreation Association
SEST	- Swedish-European Submillimeter Telescope
SET	- Software Engineering Technology
SETI	- Search for ExtraTerrestrial Intelligence
SF	- San Francisco
SF	- Science Fiction; Speculative Fiction
SF	- Single Frequency
SF	- Standard Form
SF	- Star Frontiers
SFD	- Sun Federal Division
SFDM	- Statistical Frequency Division Multiplexing
SFMC	- Satellite Facility Management Center
SFO	- San Francisco CA
SFRPG	- Science Fiction Role Playing Game
SG	- Signal Ground
SG	- StarGuard
SG	- SubGroup
SG	- SuperGroup
SGI	- Silicon Graphics Incorporated
SGML	- Standard Generalized Markup Language
SGMP    - Simple Gateway Monitoring Protocol (superseded by SNMP)
SHAPE	- Supreme Headquarters Allied Powers Europe
SHAR	- SHell ARchiver
SHCD	- Sherlock Holmes Consulting Detective
SHF	- Super High Frequency (3-30GHz)
SHRPG	- Super Hero Role Playing Game
SI	- Staten Island
SI	- Status Indicator
SI	- System Integrater
SIAM	- Society for Industrial and Applied Mathematics
SIC	- Second In Command
SIC	- Silicon Integrated Circuit
SICK	- Single Income, Coupla' Kids
SID	- Sudden Ionospheric Disturbance
SID	- System IDentification
SIG	- Special Interest Group
SIGCAT	- Special Interest Group for Cd-rom Applications Technology
SIMD	- Single Instruction, Multiple Data
SIMM	- Single Inline Memory Module
SINE	- SINE is not EINE
SIP	- Single Inline Pin
SIPB	- Student Information Processing Board
SIPC	- Securities Investment Protection Corporation
SIPP	- Strategic Industry Partners Program
SIPS	- Satellite Imagery Processing System
SIR	- Shuttle Imaging Radar
SIRTF	- Space (formerly Shuttle) InfraRed Telescope Facility
SIS	- Software Information Services
SIS	- Strategic Information System
SISAL	- Streams and Iteration in a Single-Assignment Language
SISCOM	- Satellite Information System COMpany
SIT	- Special Information Tone
SITA	- Societe Internationale Telecommunications Aeronautiques
SJ	- Society of Jesus
SJC	- San Jose CA
SKU	- Stock Keeping Unit
SL	- Salvage Loss
SL	- Space Launch [Space]
SL	- SpaceLab
SLA	- Special Libraries Association
SLA	- Symbionese Liberation Army
SLA	- Synchronous Line Adapter
SLALOM	- Scalable Language-independent Ames Laboratory One-minute Measurement
SLAN	- Sine Loco, Anno, (vel) Nomine (without place, year, or name)
SLAPP	- Strategic Litigation Against Protesting People
SLAR	- Side Looking Airborne Radar
SLBM	- Submarine Launched Ballistic Missiles
SLC	- Space Launch Complex [Space]
SLC	- Subscriber Loop Carrier
SLC	- Super Low Cost
SLDC	- Synchronous Data Link Control
SLE	- Screening Line Editor
SLED	- Single Large Expensive Drive
SLIC	- Subscriber Line Interface Circuit
SLIC	- System Link and Interrupt Controller (Sequent)
SLIM	- Subscriber Line Interface Module
SLIP	- Serial Line Internet Protocol
SLP	- Super Long Play (VHS VCR, aka EP)
SLS	- Space(lab) Life Sciences
SLUFAE	- Surface Launched Unit, Fuel Air Explosive
SM	- Service Mark
SM	- Switching Module
SMA	- Sergeant Major of the Army
SMA	- Spectrum Manufacturers Association
SMAS	- Supplementary MAin Store
SMAS	- Switched Maintenance Access System
SMASF	- SMAS Frame
SMASPU	- SMAS Power Unit
SMB	- System Message Block
SMC	- Small Magellanic Cloud (see LMC)
SMD	- Storage Module Device (interface standard for disk drives)
SMD	- Surface Mounted Devices
SMDF	- Subscriber Main Distributing Frame
SMDI	- Subscriber Message Desk Interface
SMDR	- Station Message Detail Recording
SMDR	- Station Message Detailed Recording
SMDS	- Switched Multimegabit Data Service
SMDS    - switched multimegabit data service, Bellcore-developed standard
SME	- Society of Manufacturing Engineers
SME	- Solar Mesosphere Explorer
SMEGMA	- Sophisticated Modern Editor with Gloriously Magnificent Abilities
SMERSH	- abbr. of Russian phrase meaning "Death to the spies."
SMEX	- SMall EXplorers
SMG	- SuperMasterGroup
SMI	- Structure of Management Information
SMI	- Sun Microsystems Inc.
SMILS	- Sonobuoy Missile Impact Location System
SMIT	- System Management Interface Tool
SMM	- Solar Maximum Mission
SMO	- Santa Monica CA
SMOC	- Small Matter Of Commitment
SMOH	- Since Major OverHaul
SMOP	- Small Matter Of Programming
SMP	- Symmetric MultiProcessing
SMPTE	- Society of Motion Picture and Television Engineers
SMR	- Service Marketing Representative
SMS	- Service Management System
SMSA	- Standard Metropolitan Statistical Area
SMT	- Surface Mount Technology
SMTP	- Simple Mail Transfer Protocol
SN	- Subnetwork Number
SN	- Super Nova
SNA	- Santa Ana (Orange County) CA
SNA	- Systems Network Architecture [IBM]
SNADS	- SNA Distribution Services
SNADS	- Systems Network Architecture Distribution Service
SNAFU	- Situation Normal -- All Fouled/F***ed Up
SNAP	- Shipboard Non-tactical Automated data Processing program
SNAP	- SubNetwork Access Protocol
SNAP	- System and Network Administration Program
SNCF	- Societe National des Chemins de Fer (French National Railways)
SNET	- Southern New England Telephone
SNF	- Server Normal/Natural Format
SNF	- Server-Natural Format
SNM	- SunNet Manager
SNMP	- Simple Network Management Protocol
SNOBOL	- StriNg Oriented symbOLic Language
SNPA	- SubNetwork Point of Attachment
SNR	- Signal to Noise Ratio
SNR	- SuperNova Remnant
SNTSC	- Super NTSC (video)
SNU	- Solar Neutrino Units
SO	- Sales Order
SO	- Seller's Option
SO	- Significant Other
SO	- Space Opera
SO	- Strike Out
SOAC	- Service Order Analysis Control
SOAP	- Symbolic Optimizing Assembler Program
SOAR	- Smalltalk On A Risc
SOB	- Son of a B***h
SOC	- Service Oversight Center
SOF	- Sales Order Form
SOFIA	- Stratospheric Observatory For Infrared Astronomy
SOH	- Service Order History
SOH	- Start Of Header, ASCII control character (dec=01,control-A)
SOHIO	- Standard Oil of oHIO [Corporate name]
SOHO	- SOlar Heliospheric Observatory
SOL	- Short on Landing (or, colloquially, Shit Out of Luck)
SOMM	- Stop On Micro-Match
SONAR	- SOund Detection And Ranging
SONAR	- Service Order Negotiation And Retrieval
SONDS	- Small Office Network Data System
SONET	- Synchronous Optical NETwork
SOP	- Standard Operating Procedure
SOR	- Sales Order Request
SOS	- Save Our Souls (International standard distress call, Morse ...---...)
SOS	- Silicon On Sapphire
SOW	- Statement Of Work
SP	- Shore Patrol
SP	- Short Play (VHS VCR)
SP	- Signal Processor
SP	- Signaling Point
SP	- Southern Pacific (railroad) [Corporate name]
SP	- Stack Pointer
SP	- Standard Play (VHS VCR)
SP	- Star Patrol
SP	- System Product (IBM VM)
SPA	- Software Publishers Association
SPAG	- Standards Promotion and Applications Group
SPAN	- Space Physics Analysis Network
SPAN	- System Performance ANalyzer
SPAR	- Stock Points Adp Replacement
SPARC	- Scalable Processor ARChitecture
SPARC	- Standards, Planning, And Requirements Committee
SPARS	- Society of Professional Audio Recording Studios
SPAWAR	- naval SPAce and WARfare command
SPC	- Software Productivity Consortium
SPC	- Southern Pacific Communications
SPC	- Statistical Process Control
SPC	- Stored Program Control
SPCA	- Society for the Prevention of Cruelty to Animals
SPCC	- Society for the Prevention of Cruelty to Children
SPCS	- Stored Program Control Systems
SPD	- Software Products Division
SPDL	- Standard Page Description Language (ISO)
SPDM	- Special Purpose Dextrous Manipulator
SPE	- Symbolic Programming Environment
SPEC	- Standard Performance Evaluation Corporation
SPI	- Serial Peripheral Interface
SPIM	- Sun Product Information Meeting
SPITBOL	- SPeedy ImplemenTation of snoBOL
SPL	- System Programming Language
SPNI	- Society for the Protection of Nature in Israel
SPOT	- Systeme Probatoire pour l'Observation de la Terre
SPR	- Software Problem Report
SPS	- Solar Power Satellite [Space]
SPS	- Standby Power System
SPU	- System Processing Unit
SPUCDL	- Serial Peripheral Unit Controller/Data Link, "SPUC/DL"
SPUD	- Storage Pedestal Upgrade Disk/Drive
SPUR	- Systech Pluraxial Unplug Repeater
SQA	- Software Quality Assurance
SQC	- Statistical Quality Control
SQE	- Signal Quality Error ("heartbeat")
SQL	- Structured Query Language
SQLDS	- Structured Query Language/Data System, "SQL/DS"
SQUID	- Superconducting QUantum Interference Device
SR	- Sales Representative
SR	- Street Regal (KDX)
SRA	- Selective Routing Arrangement
SRAM	- Scratchpad RAM
SRAM	- Short Range Attack Missile
SRAM	- Static RAM
SRB	- Solid (fuel) Rocket Booster [Space]
SRD	- Secondary Receive Data
SRI	- Stanford Research Institute (now called SRI International)
SRM	- Solid Rocket Motor
SRO	- Standing Room Only
SRP     - source routing protocol, an IBM specification
SRS	- Service Repair System
SRTS	- Secondary Ready To Send
SS	- Sales Support
SS	- Sparc Station
SS	- Special Services
SS	- Stop Ship
SSA	- Soaring Society of America
SSA	- Social Security Administration [U.S. Government]
SSAP	- Session Service Access Memory
SSAS	- Station Signaling and Announcement Subsystem
SSB	- Single SideBand
SSBAM	- Single-SideBand Amplitude Modulation
SSC	- Special Services Center
SSC	- Specialized Systems Consultants
SSCP	- Subsystem Services Control Point
SSCP	- System Services Control Point
SSDU	- Session Service Data Unit
SSE	- Software Support Engineer
SSE	- South-SouthEast
SSEL	- Session Service Selector
SSF	- Space Station Fred (er, Freedom)
SSFF	- Showcase Software Factory of the Future
SSG	- Staff SerGeant
SSI	- Small Scale Integration
SSI	- Solid-State Imager (on Galileo)
SSI	- Space Services Incorporated [Space]
SSI	- Space Studies Institute
SSI	- Supplemental Security Income
SSME	- Space Shuttle Main Engine
SSO	- Satellite Switching Office
SSP	- Signal Switching Point
SSP	- Sponsor Selective Pricing
SSP	- System Status Panel
SSPC	- SSP Controller
SSPF	- Space Station Processing Facility
SSPRU	- SSP Relay Unit
SSPS	- Satellite Solar Power Station [Space]
SSR	- Secondary Surveillance Radar
SSR	- Soviet Socialist Republic
SSRMS	- Space Station Remote Manipulator System
SSS	- Selective Service System
SSS	- System Support Specialist
SST	- Spectroscopic Survey Telescope
SST	- Spread-Spectrum Technology
SST	- SuperSonic Transport
SSTO	- Single Stage to Orbit [Space]
SSTTSS	- Space-Space-Time-Time-Space-Space network
SSTV	- Slow Scan TeleVision
SSW	- South-SouthWest
ST	- STart
ST	- Seagate Technologies
ST	- Short Ton
ST	- Star Trek
ST:TFF	- Star Trek: The Final Frontier
ST:TMP	- Star Trek: The Motion Picture
ST:TNG	- Star Trek: The Next Generation
ST:TSFS	- Star Trek: The Search for Spock
ST:TUC	- Star Trek: The Undiscovered Country
ST:TVH	- Star Trek: The Voyage Home
ST:TWOK	- Star Trek: The Wrath of Khan
STAGE	- Structured Text And Graphics Editor
STARS	- Software Technology for Adaptable, Reliable Systems
STB	- Software Technical Bulletin
STC	- Serving Test Center
STC	- Supplemental Type Certificate
STC	- Switching Technical Center
STD	- Sacrae Theologiae Doctor (doctor of sacred theology)
STD	- Secondary Transmit Data
STD	- Sexually Transmitted Disease (replaces VD)
STD	- State Transition Diagram
STD	- Subscriber Trunk Dialing [British, and elsewhere; equiv. DDD in USA]
STDM	- Statistical Time Division Multiplexing
STI	- Standard Tape Interface
STILO	- Scientific and Technical Intelligence Liaison Office
STIS	- Space Telescope Imaging Spectrometer (to replace FOC and GHRS)
STL	- St. Louis (Lambert) MO
STN	- SuperTwisted Nematic
STOH	- Since Top Overhaul (cylinders, etc., but not crankshaft, etc.)
STOL	- Short TakeOff and Landing
STP	- Signal Transfer Point
STP	- Software Through Pictures
STP	- Standard Temperature and Pressure (see NTP)
STP     - spanning tree protocol, an IEEE 802.1 routing specification
STRPG	- Star Trek:  The Role-Playing Game
STS	- Sales Technical Support
STS	- Shared Tenant Service
STS	- Shuttle Transport System (or) Space Transportation System
STS	- Space-Time-Space network
STSCI	- Space Telescope Science Institute, "STScI"
STSI	- Space Telescope Science Institute
STTNG	- Star Trek: The Next Generation, "ST:TNG"
STTOS   - Star Trek: The Old Stuff/The Original Series, "ST:TOS"
STV	- Single Transferable Vote
STV	- Space Transfer Vehicle [Space]
SU	- Set Uid
SUCCESS	- SUn Corporate Catalyst Electronic Support Service
SUG	- Sun User's Group
SUID	- Set UID
SUM	- Symantec Utilities for Macintosh
SUN	- Stanford University Network
SUNDIAG - SUN system DIAGnostics software
SUNET	- Swedish University NETwork
SUNOCO	- SUN Oil COmpany [Corporate name]
SUNVIEW        - SUN's Visual / Integrated Environment for Workstations
SUNY	- State University of New York
SURANET	- Southeastern Universities Research Association network, "SURAnet"
SURF	- Sequent Users Resource Forum
SUSP	- System Use Sharing Protocol
SVC	- Switched Virtual Circuits
SVID	- System V Interface Definition
SVP	- Schematic Verification Program
SVR4	- System V Release 4
SVS	- Switched Voice Service
SVVS	- System V Validation Suite
SVVS	- System V Verification Suite
SW	- South West
SW	- SuperWorld
SWAN	- Sun Wide Area Network
SWAS	- Submillimeter Wave Astronomy Satellite
SWB	- SouthWestern Bell
SWF	- ShortWave Fading
SWIFT	- Society for Worldwide Interbank Financial Transfers
SWIPE	- SoftWare IP Encryption
SWM	- Solbourne Window Manager
SWO	- Sales Work Order
SWS	- Scientific Workstation Support (at ORNL)
SX	- SimpleX signaling
SXS	- Step by (X) Step switching [Telephony]
SYC	- SYstem Control
SYMPL	- SYsteMs Programming Language
SYN	- SYNchronizing segment
SYSGEN	- SYStem GENeration
T	- Tip
T	- Traveler
T	- tera- (SI prefix)
T	- tesla
T	- ton(s), "t."
T	- tonne(s), "t."
T	- tritium
T	- tun(s), "t."
T1	- 1.544Mbps [telephony], one of the basic signalling systems 24x64Kb
T1FE	- T1 carrier Front End
T1OS	- T1 carrier OutState, "T1/OS"
T3	- 44.736 Mbps (eq 28 T1 channels) [Telephony]
TA	- Teaching Assistant
TA	- Terminal Adaptor
TA	- Territorial Army 
TA	- Transfer Allowed
TAB	- Tape Assembly Bonding
TAB	- Technical Assistance Board
TAC	- Tactical Air Command (see SAC)
TAC	- Terminal Access Circuit
TAC	- Terminal Access Controller [ARPAnet/MILNET/DDN]
TACCS	- Tactical Army Combat service support Computer System
TAE	- Transportable Applications Environment
TAG	- Technical Advisory Group (ISO)
TAL	- Transatlantic Abort Landing (Shuttle abort plan)
TAM	- Total Available Market
TANSTAAFL	- There Ain't No Such Thing As A Free Lunch
TAP	- Telephone Assistance Plan
TAR	- Tape ARchiver
TAS	- Telephone Answering Service
TASC	- Technical Assistance Service Center
TASC	- Telecommunications Alarm Surveillance and Control system
TASI	- Time Assignment Speech Interpolation system
TAT	- Thematic Apperception Test
TAT	- TransAtlantic Telephone
TAT	- Turn Arround Time
TAU	- Thousand Astronomical Units [Space]
TB	- TuBerculosis
TBA	- To Be Announced/Arranged
TBD	- To Be Designed/Determined
TBO	- Time Between Overhaul
TC	- Teachers College
TC	- Technical Committee (ISO)
TC	- Timing Counter
TC	- Tinned Copper
TC	- Toll Center
TC	- Total Color
TCA	- Terminal Control Area
TCA	- Terminal Controlled Airspace
TCAP	- Transaction Capabilities Applications Port
TCAS	- T-Carrier Administration System
TCB	- Task Control Block
TCB	- Trusted Computer Base
TCC	- Trunk Class Code
TCCC	- Technical Committee on Computer Communications
TCG	- Test Call Generation
TCM	- Time Compression Multiplexer
TCM	- Trellis Coded Modulation
TCP	- Transmission Control Protocol
TCPIP	- Transmission Control Protocol/Internet Protocol, "TCP/IP"
TCR	- Transient Call Record
TCS	- Thermal Control System
TCS	- Traction Control System (to prevent wheel-spin)
TCSEC	- Trusted Computer System Evaluation Criteria (orange book)
TCT	- To Challenge Tomorrow
TCT	- Toll Connecting Trunk
TD	- TouchDown
TD	- Transmit Data
TD	- Treasury Department
TDAS	- Traffic Data Administration System
TDC	- Tape Data Controller
TDC	- Terrestrial Data Circuit
TDCC	- Transportation Data Coordinating Committee
TDD	- Telecommunications Device for Deaf
TDD	- Telephone Device for the Deaf
TDE	- Transition Diagram Editor
TDI	- Trusted Database Interpretation
TDL	- Test Description Language
TDM	- Time-Division Multiplexing
TDMA	- Time-Division Multiple Access
TDO	- Table of Denial Orders
TDR	- Time Domain Reflectometer
TDRS	- Tracking and Data Relay Satellite [Space]
TDRSS	- Tracking and Data Relay Satellite System
TDY	- Temporary DutY
TE	- Terminal Equipment
TE	- Transverse Electric
TEB	- Teterboro NJ
TEC	- Technology Exchange Company
TECO	- Tape Editor and COrrector
TEFLON	- polyTEtraFLuOrethyleNe
TEHO	- Tail End Hop Off
TELEX	- TELetypewriter EXchange
TELSAM	- TELephone Service Attitude Measurement
TEMA	- Tubilar Exchanger Manufacturers Association
TEMPEST	- Transient Electro-Magnetic Pulse Emanation STandard
TEMPO	- Technical Military Programming Organization
TER	- Technical Education Resources
TERM	- TERMinal
TES	- Thermal Emission Spectrometer (on Mars Observer)
TFC	- Total Full Color
TFLAP	- T-carrier Fault-Locating Applications Program
TFP	- Tops Filing Protocol
TFS	- Translucent File System
TFS	- Trunk Forecasting System
TFT	- The Fantasy Trip
TFT	- Thin Film Transistor
TFTP	- Trivial File Transfer Protocol
TG	- Thieves' Guild
TGC	- Terminal Group Controller
TGN	- Trunk Group Number
TGV	- Two Guys and a Vax
TH	- Trouble History
THIEF	- THief/This Here Isn't Even Fine
THOR	- THermal Optical Recording
THOR	- Tandy High-intensity Optical Recording
THRUSH	- Technological Hierarchy for the Removal of Undesireables and Subjugation of Humanity
THX	- Tom Holman Xover
TI	- Texas Instruments
TI	- Transport Independent
TIA	- Telephone Information Access
TIA	- Thanks In Advance [net jargon]
TIA	- Transient Ischemic Attack
TIC	- TermInfo Compiler
TID	- Ter In Die (three times a day)
TIFF	- Tag Image File Format
TIFF	- Tagged Image File Format
TINA	- TINA Is Not an Acronym
TINA	- This Is Not an Acronym
TIP	- Team Improvement Program
TIRKS	- Trunk Integrated Record Keeping System
TIROS	- Television InfraRed Observation Satellite
TKO	- Technical Knock Out
TL	- Total Loss
TLA	- Three Letter Acronym
TLB	- Translation lookaside buffer
TLC	- Tender Loving Care
TLI	- Transport Level Interface (AT&T stream-based protocol)
TLM	- Trouble Locating Manual
TLN	- Trunk Line Network
TLP	- Transmission Level Point
TLTP	- Trunk Line and Test Panel
TLV	- Type, Length, Value
TM	- TradeMark
TM	- Transverse Magnetic
TMA	- Tycho Magnetic Anomaly [movie 2001]
TMAC	- Treasury department's Multiuser Acquisition Contract
TMDF	- Trunk Main Distributing Frame
TMIS	- Telecommunications Management Information System
TMMS	- Telephone Message Management System
TMO	- Telephone Money Order
TMP	- The Morrow Project
TMR	- Transient Memory Record
TMRC	- Tech Model Railroad Club [MIT]
TMRC	- Transportation Modeling Research Center (TMRC {above} alter ego)
TMRS	- Traffic Measurement and Recording System
TMRS	- Traffic Metering Remote System
TMS	- Time-Multiplexed Switch
TMSC	- Tape Mass Storage Control (DEC)
TN	- Telephone Number
TN	- Tennessee
TN	- Transaction Number
TN	- Twisted Nematic
TNC	- Threaded Navy Connector
TNC	- Threaded Neill Concelman (connector) [electronics] (see also BNC)
TNDS	- Total Network Data System
TNN	- Trunk Network Number
TNOP	- Total Network Operation Plan
TNPC	- Traffic Network Planning Center
TNT	- The NeWS Toolkit
TNT	- TriNitroToluene
TO	- Telegraph Office
TO	- Turn Over
TOC	- Table Of Contents
TOD	- Time-Of-Day
TODS	- Transactions on Database Systems (ACM)
TOMS	- Total Ozone Mapping Spectrometer
TOMS	- Transactions on Mathematical Software (ACM)
TOOIS	- Transactions on Office Information Systems (ACM)
TOP	- Technical/Office Protocol
TOPICS	- Total On-Line Program and Information Control System (NHK)
TOPLAS	- Transactions on Programming Languages and Systems (ACM)
TOPS	- Timesharing OPerating System
TOPS	- Traffic Operator Position System
TOPS	- Transcendental OPerating System
TORES	- Text ORiented Editing System
TOS	- Transfer Orbit Stage [Space]
TOW	- Tube launched, Optically tracked, Wire guided missile
TOY	- Time Of Year (clock)
TP	- Test Plan
TP	- Third Party
TP	- Toll Point
TP	- Transaction Processing
TP	- Transport Protocol
TP	- Twisted Pair
TP	- from TP0 and TP4 (ISO/CCITT Transport Services; like TCP)
TP0	- OSI Transport Protocol Class 0 (Simple Class)
TP4	- OSI Transport Protocol Class 4 (Error Detection and Recovery Class)
TPC	- The Phone Company [movie The President's Analyst)
TPE	- Twisted Pair Ethernet
TPI	- Tracks Per Inch
TPM	- Third-Party Maintenance
TPMP	- Total network data system Performance Measurement Plan
TPO	- Traveling Post Office
TPS	- Technical Publication Software
TPS	- Technical Publishing Software
TPS	- TeleProcessing Services
TPS	- Thermal Protection System
TPT	- Twisted Pair Transceiver
TQC	- Total Quality Control
TQM	- Total Quality Management
TR	- Test Register
TR	- Token Ring
TR	- Transfer Register
TRAC	- Total Risk Analysis Calculation (SunTrac)
TREAT	- Trouble Report Evaluation Analysis Tool
TRIB	- Transfer Rate of Information Bits
TRMTR	- TRamsMiTteR
TROFF	- Text RunOFF, text formatter
TROFF	- Typsetter new ROFF
TRON	- The Real-time Operating Nucleus
TRON	- The Realtime Operating system Nucleus
TRR	- Tip-Ring Reverse
TRR	- Token Ring Repeater
TRSA	- Terminal Radar Service Area
TRUSIX	- TRUSted unIX
TRW	- Thompson, Ramo, and Woolridge
TS	- Top Secret
TSAP	- Transport Service Access Point
TSCPF	- Time Switch and Call Processor Frame
TSD	- Total System Design
TSDU	- Transport Service Data Unit
TSE	- Technical Support Engineer (Sun)
TSEL	- Transport Service Selector
TSI	- Time Slot Interchanger
TSM	- Tech Support Manager
TSO	- Technical Standard Order
TSO	- Time Sharing Option
TSORT	- Transmission System Optimum Relief Tool
TSP	- Teleprocessing Services Program
TSP	- Test SuPervisor
TSP	- Thrift Savings Plan
TSP	- Time Synchronization Protocol
TSP	- Traffic Service Position
TSP	- TriSodium Phosphate
TSPS	- Traffic Service Position System
TSR	- TSR (Fortune 500 Company that manufactures Dungeons & Dragons)
TSR	- Terminate and Stay Resident
TSR	- Test Summary Report
TSS	- Tethered Satellite System [Space]
TSS	- Time-Sharing System
TSS	- Trunk Servicing System
TSST	- Time-Space-Space-Time network
TST	- Time-Space-Time network
TST	- Traveling-Wave Tube
TSTO	- Two Stage to Orbit [Space]
TSTS	- Time-Space-Time-Space network
TT	- Trunk Type
TT	- Tunnels & Trolls, "T&T"
TTC	- Telecommunications Technology Council
TTC	- Terminating Toll Center
TTD	- Things To Do
TTFN	- Tah Tah, For Now
TTL	- Time To Live
TTL	- Transistor-Transistor Logic
TTMA	- Tennessee Tech Microcomputer Association
TTP	- Telephone Twisted Pair
TTP	- Trunk Test Panel
TTS	- Trunk Time Switch
TTTN	- Tandem Tie Trunk Network
TTU	- Tennessee Technological University
TTY	- TeleTYpe(writer)
TTYC	- TTY Controller
TUNIS	- Toronto UNIversity System
TUR	- Traffic Usage Recording
TUR	- Trunk Utilization Report
TV	- TeleVision
TVA	- Tennessee Valley Authority
TVTWM	- Tom's Virtual TWM
TW	- Thieves' World
TWA	- Trans World Airlines
TWG	- The Wollongong Group
TWIMC	- To Whom It May Concern
TWM	- Tab (or Tom's) Window Manager
TWT	- Traveling Wave Tube
TWX	- TeletypeWriter eXchange
TX	- Texas
TX	- Transmit
TX	- Transuction
TXID	- Transuction Identifier
U	- (representing the greek mu) - micro, "u"
U	- Universe
U	- unified atomic mass unit, "u"
U	- uranium
UA	- United Artists
UA	- User Agent
UAB	- UNIX Appletalk Bridge
UAE	- United Arab Emerates
UAPDU	- User Agent Protocol Data Unit
UAR	- United Arab Republic
UAR	- User Action Routine
UARS	- Upper Atmosphere Research Satellite
UART	- Universal Asynchronous Receiver and Transmitter
UBA	- UniBus Adapter [DEC]
UBC	- Universal Bibliographic Control
UBC	- University of British Columbia
UBM	- Unpressurized Berthing Mechanism
UC	- University of CA
UC	- upper case, "u.c."
UCAR	- University Corporation for Atmospheric Research
UCB	- University of California at Berkeley
UCC	- Uniform Commercial Code
UCD	- Uniform Call Distribution
UCD	- University of California at Davis
UCI	- University of California at Irvine
UCL	- Underwater Sound Laboratory
UCL	- University College London
UCLA	- University of California at Los Angeles
UCR	- University of California at Riverside
UCSB	- University of California at Santa Barbara
UCSC	- University of California at Santa Cruz
UCSD	- University of California at San Diego
UCSF	- University of California at San Francisco
UDB	- Unified DataBase
UDMH	- Unsymmetrical DiMethyl Hydrazine
UDP	- User Datagram Protocol
UDT	- User Defined Type
UEC	- User Environment Component
UFO	- Unidentified Flying Object
UFS	- Universal File System
UG	- Micro-Grip (HP plotter paper positioner)
UGC	- Uppsala General Catalog
UH	- Upper Half
UHF	- Ultra High Frequency (300-3000MHz)
UI	- Unix International
UI	- User Interface
UIC	- User Identification Code
UID	- User IDentity
UIL	- User Interface Language
UIMS	- User Interface Management System
UIP	- User Interface Program
UIT	- Ultraviolet Imaging Telescope (Astro package)
UITP	- Universal Information Transport Plan
UIUC	- University of Illinois at Urbana-Champaign
UK	- United Kingdom
UKST	- United Kingdom Schmidt Telescope
UL	- Underwriters Laboratory
ULANA	- Unified LAN Architecture
ULANA	- Unified Local-Area Network Architecture
UMT	- Universal Military Training
UN	- United Nations
UNCLE	- United Network Command for Law Enforcement
UNESCO	- United Nations Educational, Scientific, & Cultural Organization
UNICEF	- United Nations International Children's Emergency Fund (now UN Child. Fund)
UNICS	- UNiplex Information Computer Services
UNISTAR	- UNIversal Single call Telecommunications Answering & Repair
UNIVAC	- UNIversal Automatic Computer
UNIX	- not an acronym at all.  Was a pun on MIT's MULTICS.
UNMA	- Unified Network Management Architecture
UNO	- United Nations Organization
UP	- Union Pacific (railroad) [Corporate name]
UP	- Upper Peninsula (of Michigan)
UPC	- Universal Product Code
UPDS	- Uninterruptible Power Distribution System
UPI	- United Press International [Corporate name]
UPS	- Uninterruptible Power Supply
UPS	- United Parcel Service [Corporate name]
UR	- University of Rochester
UREP	- UNIX-RSCS Emulation Program (BITNET software for UNIX)
URL	- Uniform Resource Locator
US	- United States (of America)
USA	- Union of South Africa
USA	- United States Army
USA	- United States of America
USAC	- US Answer Center (Sun Hotline)
USAC	- United States Answer Center
USAC	- United States Auto Club
USAF	- United States Air Force
USAFA	- United States Air Force Academy (near Colorado Springs)
USAN	- University Satellite Network
USB	- Upper Side Band
USC	- University of Southern California
USCA	- United States Code, Annotated
USCG	- United States Coast Guard
USD	- Underwriters Safety Device
USDA	- United States Department of Agriculture
USES	- United States Employment Service
USFL	- United States Football League
USG	- Unix Support Group
USGS	- United States Geological Survey
USHGA	- United States Hang Gliding Association
USIA	- United States Information Agency
USITA	- United States Independent Telephone Association
USL	- Unix System Laboratories
USM	- United States Mail
USMA	- United States Military Academy
USMC	- United States Marine Corps
USMP	- United States Microgravity Payload
USN	- United States Navy
USNA	- United States Naval Academy (in Annapolis)
USO	- United Service Organizations
USO	- Universal Service Order
USO	- Unix Software Operation
USOC	- Universal Service Order Code
USP	- United States Pharmacopeia
USP	- Universal Sampling Plan
USPS	- United States Postal Service
USPTO	- United States Patent and Trademark Office
USR	- User Service Routines
USS	- United States Ship
USSR	- Union of Soviet Socialist Republics
USSS	- User Services and Systems Support
USW	- Und So Weiter
UT	- UTah
UT	- Universal Time
UT	- University of Tennessee
UT	- University of Texas
UTC	- Universal Coordinated Time
UTE	- Union Technique de i"Electricite"
UTP	- Unshielded Twisted Pair
UTQGS	- Uniform Tire Quality Grading System
UTR	- UpTime Ratio
UUCICO	- Unix to Unix Copy Incoming Copy Outgoing
UUCP	- Unix-to-Unix CoPy
UUG	- Unix User Group
UUT	- Unit Under Test
UV	- UltraViolet
UVS	- UltraViolet Spectrometer
UW	- UnderWriter
UW	- University of Wisconsin
UWCSA	- University of Washington Computer Science Affiliates
UWS	- Ultrix Workstation Software
V	- Vergeltungswaffe (reprisal weapon: V1, V2)
V	- fiVe
V	- vanadium
V	- version, "v"
V	- versus, "v."
V	- volt(s)
VA	- Veterans Administration
VA	- Virginia
VAB	- Value Added Business
VAB	- Vehicle Assembly Building (formerly Vertical Assembly Building)
VABIS	- Vagn Aktie Bolaget i Soedertaelje (Swedish truck company)
VAC	- Volts of Alternating Current
VAD	- Value Added Dealer
VADS	- Verdix Ada Development System
VAFB	- Vandenberg Air Force Base
VAN	- Value-Added Network (e.g. Tymnet, Telenet, etc)
VANS	- Value-Added Network Services
VAP	- Value-Added Process
VAR	- Value-Added Remarketer/Reseller
VASCAR	- Visual Average Speed Computer And Recorder
VASI	- Visual Approach Slope Indicator
VAST	- Virtual Archive Storage Technology
VAT	- Value Added Tax
VAV	- Value Application Venders
VAX	- Virtual Address eXtended
VAXBI	- VAX Bus Interconnect
VB	- Venture Business
VC	- Virtual Circuit
VCCI	- Volantary Control Council for Intersive
VCM	- Voice Coil Motor
VCO	- Voltage Controlled Oscillator
VCR	- VideoCassette Recorder
VCS	- Virtual Circuit System
VCU	- Virginia Commonwealth University
VD	- Venereal Disease (see also STD)
VDC	- Volts of Direct Current
VDE	- Verband Deutscher Electrotechniker
VDFM	- Virtual Disk File Manager
VDI	- Virtual Device Interface
VDM	- Vienna Development Method
VDM	- Virtual Device Metafile
VDT	- Video Display Terminal
VE	- Value Engineering
VEEGA	- Venus-Earth-Earth Gravity Assist (Galileo flight path)
VEU	- Volume End User
VEX	- Video Extension to X
VF	- Video Frequency
VF	- Voice Frequency
VFEA	- VMEbus Futurebus+ Extended Architecture
VFO	- Variable Frequency Oscillator
VFR	- Visual Flight Rules
VFS	- Virtual File System
VFW	- Veterans of Foreign Wars
VFW	- Volunteer Fire Department
VFY	- VeriFY
VG	- Very Good
VG	- Vicar-General
VGA	- Video Graphics Array/Accelerator
VGF	- Voice Grade Facility
VGI	- Virtual Graphics Interface
VHD	- Video High Density
VHDL	- Vhsic Hardware Description Language
VHF	- Very High Frequency (30-300MHz)
VHS	- Video Home System (VCR)
VHSIC	- Very High Speed Integrated Circuit
VI	- VIsual editor
VIABLE	- Vertical Installation Automation BaseLinE
VIC	- V.35 Interface Cable
VIFRED	- VIsual FoRms EDitor
VILE	- VI-Like Emacs
VINE	- Vine Is Not Emacs
VINES	- VIrtual NEtwork Software
VIP	- Very Important Person
VISTA	- Volunteers In Service To America
VITA	- Vme International Trade Association
VIU	- Voiceband Interface Unit
VJ	- Video Jockey
VL	- Vulgar Latin
VLA	- Very Large Array radio telescope in Arizona or New Mexico
VLBA	- Very Long Baseline Array
VLBI	- Very Long Baseline Interferometry
VLF	- Very Low Frequency (3-30KHz)
VLIW	- Very Long Instruction Word
VLSI	- Very Large Scale Integration
VLT	- Very Large Telescope
VM	- Virtual Machine
VM	- Virtual Memory
VMC	- Visual Meteorological Conditions
VMCF	- Virtual Machine Communications Facility
VMCMS	- Virtual Machine/Conversational Monitor System, "VM/CMS"
VME	- Versa Modular Europa
VME	- Versabus Module Europe
VME	- Virtual Machine Environment
VMI	- Virginia Military Institute
VMM	- Virtual Memory Manager
VMOS	- Vertical Metal Oxide Semiconductor (V-MOS) (see MOS)
VMR	- Vertical Market Reseller
VMR	- Volt-Meter Reverse
VMRS	- Voice Message Relay System
VMS	- Vertical Motion Simulator
VMS	- Virtual Memory System
VMS	- Virtual Memory operating System
VMS	- Voice Mail System
VMS	- Voice Management System
VMSP	- Virtual Machine/System Product, "VM/SP"
VMTP	- Versatile Message Transaction Protocol
VNF	- Virtual Network Feature
VNL	- Via Net Loss plan
VNLF	- Via Net Loss Factor
VNY	- Van Nuys CA
VOA	- Voice Of America
VOA	- Volunteers Of American
VODAS	- Voice Over Data Access Station
VOIR	- Venus Orbiting Imaging Radar (superseded by VRM)
VOIS	- Voice-Operated Information System
VOQ	- Visiting Officer's Quarters
VOR	- VHF Omnidirectional Range
VORT	- Very Ordinary Rendering Toolkit
VP	- View Processor
VP	- Virtual President
VPF	- Vertical Processing Facility
VPISU	- Virginia Polytechnic Institute and State University, "VPI&SU"
VPN	- Virtual Private Network
VR	- Variety Reduction
VR	- Virtual Reality
VRC	- Vertical Redundancy Character
VRM	- Venus Radar Mapper (now called Magellan)
VRM	- Virtual Resource Manager
VRM	- Voice Recognition Module
VRS	- Voice Response System
VS	- VAXStation
VSAM	- Virtual Sequential Access Method
VSAM	- Virtual Storage Access Method
VSAT	- Very Small Aperture Terminal, satellite dish
VSB	- Vestigial SideBand modulation
VSE	- Virtual Storage Extended
VSP	- Vector/Scalar Processor
VSR	- Voice Storage and Retrieval
VSS	- Voice Storage System
VSSP	- Voice Switch Signaling Point
VSX	- X/open Verification Suite
VT	- Virtual Terminal
VTAM	- Virtual Telecommunications Access Method [IBM]
VTI	- Virtual Terminal Interface
VTOC	- Volume Table Of Contents
VTOL	- Vertical TakeOff and Landing
VTP	- Virtual Terminal Protocol
VTR	- VideoTape Recorder
VTS	- Video Teleconferencing System
VU	- Volume Unit
VUIT	- Visual User Interface Tool
VUP	- Vax Unit of Performance
VV	- Villains & Vigilantes, "V&V"
VVSS	- Vertical Volute Spring Suspension
VWS	- VAX Workstation Software
VXI	- VMEbus Extension for Instrumentation
W	- Wales/Welsh
W	- Wednesday, "W."
W	- West
W	- Width
W	- watt
W	- week(s), "w."
W	- wofram (tungsten)
WA	- Washington
WA	- Western Australia
WAC	- Womens Air Corps
WADS	- Wide Area Data Service
WAG	- Wild-Assed Guess
WAIS	- Wide Area Information Server
WAN	- Wide Area Network
WAP	- Work Assignment Procedure
WARC	- World Administrative Conference
WATFOR	- WATerloo FORtran
WATS	- Wide Area Telephone Service
WATSUP	- WATfor Student Utility Program
WB	- Water Ballast
WB	- WayBill
WBC	- White Blood Cells
WBS	- Wednesday Business School
WBS	- Work Breakdown Structure
WC	- Water Closet
WC	- Wire Center
WC	- Without Charge
WCL	- Widget Creation Library
WCPC	- Wire Center Planning Center
WCS	- Writable Control Store (VAX)
WCTU	- Women's Christian Temperance Union
WD	- White Dwarf
WD	- Working Draft
WDC	- Washington, District of Columbia
WDC	- Work Distribution Chart
WDM     - wavelength-division multiplexing, for optical fibre, ultra-gigabit
WDT	- Watch Dog Timer
WELL	- Whole Earth 'Lectronic Link
WF	- Work Factor method
WFPC	- Wide Field / Planetary Camera (on HST)
WFPCII	- Replacement for WFPC
WG	- Working Group
WGS	- WorkGroup System (AT&T's 386 PC)
WH	- WarHammer
WHBL	- World Home Bible League
WHO	- World Health Organization
WHOI	- Woods Hole Oceanographic Institution
WHSE	- Warehouse
WHSGNASBN	- We Have Some Good News And Some Bad News
WI	- Wisconsin
WINS	- Wollongong Integrated Networking Solutions
WIP	- Work-In-Process
WIS	- WWMCCS Information System
WITS	- Washington Interagency Telecommunications System
WIYN	- Wisconsin / Indiana / Yale / NOAO telescope
WKS	- Well Known Services
WM	- Work Manager
WMO	- World Meteorological Organization
WMSCR	- Weather Message Switching Center Replacement
WNN	- Watashi no Namae ha Nakajima desu. (Kana-Kanji henkan), "Wnn"
WO	- Write Only
WOMBAT	- Waste Of Money, Brains, And Time
WOPR	- War Operations Planned Response (from "Wargames" movie)
WORM	- Write Once, Read Many time
WOW	- Worlds of Wonder
WP	- Word Processing
WP	- Working Paper
WPA	- Works Progress Administration
WPS	- Word Processing Software
WRT	- With Respect To
WS	- Work Sampling
WS	- Work Station
WSD	- Work Station Division
WSI	- Wafer Scale Integration
WSJ	- Wall Street Journal
WSMR	- White Sands Missile Range
WSN	- Wirth Syntax Notation
WSP	- Work Simplification Program
WSW	- West-SouthWest
WTF	- What The Fuck
WTR	- Western Test Range
WU	- Washington University
WU	- Western Union
WUPPE	- Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package)
WV	- West Virginia
WW	- World War
WW2	- World War II
WWFO	- World Wide Field Operations
WWI	- World War I
WWII	- World War II
WWMCCS	- World-Wide Military Command and Control System
WWOPS	- World-Wide Operations
WWW	- World Wide Web
WY	- Wyoming
WYSIWIS	- What You See Is What I See
WYSIWYG	- What You See Is What You Get
X25	- CCITT recommendation for packet switched networks DTE interfacing, "X.25"
XA	- eXtended Architecture (31-bit addressing in IBM machines)
XB	- X-Bar
XBT	- X-Bar Tandem
XCF	- eXperimental Computing Facility
XD	- eX (without) Dividend
XD	- without Dividend
XDMCP	- X Display Manager Control Protocol
XDR	- eXternal Data Representation
XFE	- X-Front End
XFER	- transFER (the X is for trans)
XID	- eXchange IDentification
XIE	- X Imaging Extension
XIM	- X Input Method
XINU	- Xinu Is Not UNIX
XL	- eXtra Large
XMI	- eXtended Memory Interconnect (DEC)
XMM	- X-ray Multi Mirror
XMS	- eXtended Multiprocessor operating System
XMTR	- transMiTteR (the X is for trans)
XNS	- Xerox Network Services/Systems/Standard
XO	- eXecutive Officer
XOR	- eXclusive OR (logical function)
XP	- Jesus Christ (from the first two letters of "Christ" written in Greek)
XPG	- X/Open Portability Guide
XPG2	- X/Open Portability Guide Release-2
XPORT	- transPORT (the X is for trans)
XRM	- X Resource Manager
XSECT	- cross SECTion (the X is for cross)
XT	- X.11 Toolkit, "Xt"
XTAL	- crysTAL (another version of x for crys, see XMTR)
XTAL	- crysTAL (the X is for crys)
XTC	- eXternal Transmit Clock
XUI	- X-windows User Interface
XUV	- eXtreme UltraViolet
XVIEW	- X window system-based Visual/Integrated Environment for Workstations
XWSDS	- X Window System Display Station
Y	- year, "y."
Y	- yen
Y	- yttrium
YA	- Yet Another
YACC	- Yet Another Compiler Compiler
YAFIYGI	- You Asked For It, You Got It
YB	- YearBook
YMCA	- Young Mens Christian Association
YMHA	- Young Mens Hebrew Association
YMMV	- Your Mileage May Vary  [net jargon: Your opinion may be different.]
YOB	- Year Of Birth
YP	- Yellow Pages
YPVS	- Yamaha Power Valve System
YRS	- Ysgarth Rules System
YSO	- Young Stellar Object
YST	- Yukon Standard Time
YT	- Yukon Territory
YT	- Yukon Time
YTD	- Year To Date
YWCA	- Young Womens Christian Association
YWHA	- Young Womens Hebrew Association
YY	- Year
Z	- Zenith
Z	- Zero
ZB	- Zero Beat
ZBB	- Zero Base Budgeting
ZBR	- Zone Bit Recording
ZD	- Zero Defect
ZETA	- Zero Energy Thermonuclear Assembly
ZG	- Zero Gravity
ZGS	- Zero Gradient Synchrotron
ZI	- Zonal Index
ZIF	- Zero Insertion Force
ZIP	- Zig-zag Inline Pin
ZIP	- Zone Improvement Plan (post office code)
ZIP	- Zone Information Protocol
ZK	- barrage balloon (navy symbol)
ZMRI	- Zinc Metals Research Institute
ZPG	- Zero Population Growth
ZPRSN	- Zurich Provisional Relative Sunspot Number
ZST	- Zone Standard Time
ZT	- Zone Time
ZWEI	- Zwei Was Eine Initially