2D 2-Dimensional
3D 3-Dimensional
3M Minnesota Mining and Manufacturing
4GL Fourth Generation Language
4H Head, Heart, Hands, Health
4WD Four wheel Drive (see also FWD)
A Aftermath
AA Affirmative Action committee
AA Alcoholics Anonymous
AA Antiaircraft Artillery
AA Associate in Accounting
A&A Astronomy and Astrophysics [Space]
AA Automobile Association [England]
AAA American Automobile Association
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 [Space]
AAP Affirmative Action Program
AARC Anglo-American Cataloging Rules
AARN Australian Academic Research Network [Networking]
AARP American Association of Retired Persons
AAS American Astronomical Society [Space]
AAVSO American Association of Variable Star Observers [Space]
AB ABle seaman
ABA American Bar Association
ABA American Basketball Association
ABA American Booksellers Association
ABBR ABBReviation
ABC American Broadcasting Company [Corporate name]
AC Alternating Current (ac, see also DC)
AC Ante Christum (before Christ)
AC Ante Cibum (before meals)
ACAA Agricultural Conservation and Adjustment Administration
ACAWS Advisory, Caution, And Warning System
ACBL American Contract Bridge League
ACC Argonne Code Center
ACCS Army Command and Control System
ACD Automatic Call Distributor [Telephony]
ACE Advanced Composition Explorer [Space]
ACE Advanced Computing Environments [Corporate name]
ACE Automatic Calibration and Equalization
ACHEFT Automated ClearingHouse Electronic Funds Transfer
ACK ACKnowledge
ACL Advanced Cmos Logic
ACLU American Civil Liberties Union
ACM Association for Computing Machinery
ACRV Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle [Space]
ACS Advanced Communications System
ACSE Association Control Service Entity (ISO/CCITT layer 7)
ACT Action for Children's Television (in Cambridge, MA)
ACT American Conservatory Theater
ACTS Advanced Communications Technology Satellite
ACTS Automatic Coin Telephone Service [Telephony]
ACU Alarm Control Unit
ACU Automatic Call Unit [Telephony]
ACW Alternating Continuous Waves
AD After Date
A/D Analog to Digital converter (see ADC)
AD Anno Domini (in the year of our Lord)
AD Application Development
Ad Astra To the stars [Latin, Space]
ADAP Alzheimer's disease-associated protein
ADAP American Discount Auto Parts [Corporate name]
ADB A DeBugger
ADB Apple Desktop Bus
ADC Analog to Digital Converter
ADCI Automatic Display Call Indicator
AD&D Advanced Dungeons & Dragons
ADF Automatic Direction Finder
ADM ADMiral
ADP Adenosine Di-Phosphate
ADP Administrative Data Processing
ADP Advanced Data Processing
ADPCM Pulse Code Modulation with Adaptive Quantization
ADS Application Development System
ADSR Attack Decay Sustain Release
ADT Abstract Data Type
ADT Atlantic Daylight Time
AE Application Execution
AEA American Electronics Association
AEC Atomic Energy Commission
AEF American Expeditionary Force (see BEF)
AEGIS Advanced Electronic Guidance and Instrumentation System
AF Adventures in Fantasy
AF Air Force
AF Audio Frequency
AFADS Automatic Force Adjustment Data System
AFATDS Advanced Field Artillery Tactical Data System
AFB Air Force Base
AFC American Football Conference
AFC Automatic Flight Control
AFC Automatic Frequency Control
AFCAC Air Force Computer Acquisition Center
AFCC Air Force Communications Command
AFGE American Federation of Government Employees
AFIPS American Federation of Information Processing Societies
AFL American Federation of Labor
AFL American Football League
AFLCIO American Federation of Labor and Congress of Industrial Organizations
AFNOR Association Francaise de NORmalization
AFP Appletalk Filing Protocol
AFS Andrew File System
AFSC Air Force Systems Command
AFSCME American Federation of State, County and Municipal Employees
AFTRA American Federation of Television and Radio Artists
AG Adjutant General
AG Arcade Game
AG Attorney General
AGCT Army General Classification Test
AGN Active Galactic Nucleus [Space]
AHL American Hockey League
AHQ Air HeadQuarters
AI Artificial Intelligence
AIAA American Institute of Aeronautics and Astronautics [Space]
AIC Automatic Intercept Center
AID Agency for International Development
AIDDE Ames' Interactive Dynamic Display Editor
AIDS Acquired ImmunoDeficiency Syndrome
AIOD Automatic Identification Outward Dialing
AIS Automatic Intercept System
AIX Advanced Interactive eXecutive (IBM's name for UNIX)
AJ Astronomical Journal [Space]
AK Alaska
AKA Also Known As
AL Alabama [US state postal designation]
AL American League (baseball)
ALA American Library Association
ALA Automobile Legal Association
ALBM Air-to-Land Ballistic Missile
ALC Automatic Load Control
ALGOL ALGOrithmic Language
ALIT Automatic Line Insulation Testing [Telephony]
ALPO Association of Lunar and Planetary Observers [Space]
ALS Advanced Launch System [Space]
ALU Arithmetic Logic Unit
A&M Agricultural and Mechanical
AM Amplitude Modulation
AM Ante Meridiem (before noon)
AMA American Medical Association
AMA Automatic Message Accounting [Telephony]
AMARC Automatic Message Accounting Recording Center
AMBA Association of Master of Business Administration
AMC Albany Medical College
AMC American Motors Corporation(?) [Corporate name]
AMC Appalachian Mountain Club
AMD Advanced Micro Devices [Corporate name]
AMEX AMerican EXpress [Corporate name]
AMI Alternate Mark Inversion (see also NRZ, NRZI, B8ZS)
AMORC Ancient Mystic Order Rosae Crucis
AMP Adenosine MonoPhosphate
AMPAS Academy of Motion Picture Arts and Sciences
AMPAS Acedemy of Motion Picture Arts and Sciences
AMRAAM Advanced Medium Range Air-To-Air Missile
AMROC American Rocket Company [Space]
AMSAT radio AMateur SATellite corp.
AMU Atomic Mass Unit
AMVET AMerican VETeran
ANA American Nurses Association
ANAC Automatic Number Announcemnt Circuit [Telephony]
ANC All Number Calling [Telephony]
ANC Army Nurse Corps
ANDF Architecture-Neural Distribution Format
ANF Automatic Number Forwarding [Telephony]
ANG Air National Guard
ANI Automatic Number Identification (see also: CLID) [Telephony]
ANL Argonne National Laboratory
ANOVA ANalysis Of VAriance
ANPA American Newspaper Publishers Association
ANSI American National Standards Institute
ANZUS Australia, New Zealand, United States
AO Account Of
AOA Abort Once Around [NASA, Shuttle]
AOA Abort Once Around (Shuttle abort plan) [Space]
AOL Absent Over Leave (see AWOL)
AOS Academic Operating System
AOS Alternate Operator Service [Telephony]
A/P Accounts Payable
AP Additional Premium
AP All Points
AP Associated Press [Corporate name]
APA All Points Addressable
APA American Psychological Association
APB All Points Bulletin
APDA Apple Programmers and Developers Association
API Application Programming Interface
APICS American Production and Inventory Control Society
Ap.J Astrophysical Journal [Space]
APL A Programming Language
APL acute promyelocytic leukemia [Disease]
APO Alpha Phi Omega, service fraternity
APO Army Post Office
APP Applications Portability Profile
APPC Advanced Peer-to-Peer Communications
APR Annual Percentage Rate (as in loan interest)
APSE Ada Programming Support Environment
APU Auxiliary Power Unit [Space]
AQ Accumulator-Quotient register
A/R Accounts Receivable
AR Address Register
AR Arkansas
ARC AIDS-related complex
ARC American Red Cross
ARC Ames Research Center (NASA) [Space]
ARCNET Attached Resource Computer local area NETwork
ARO After Receipt of Order
ARP Address Resolution Protocol
ARPA Advanced Research Projects Agency (of the DoD, see DARPA)
ARPANET ARPA (q.v.) NETwork
ARRL Amateur Radio Relay League
ARV American Revised Version
AS Anglo-Saxon
ASA Acetyl Salicylic Acid
ASAP As Soon As Possible
ASC Accredited Standards Committee
ASCAP American Society of Composers, Authors, and Publishers
ASCC Automatic Sequence-Controlled Calculator
ASCII American Standard Code for Information Interchange
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.
ASIC Application Specific Integrated Circuit
ASME American Society of Mechanical Engineers
ASN Abstract Syntax Notation One (ISO/CCITT ASN.1)
ASP Aggregated Switch Procurement
ASRM Advanced Solid Rocket Motor [Space]
ASSR Autonomous Soviet Socialist Republic
AST Atlantic Standard Time
ASV American Standard Version
AT Atlantic Time
ATA Automatic Trouble Analysis
ATACC Advanced Tactical Air Command Central
ATB Advanced Technology Bomber (stealth bomber)
ATC Air Traffic Control
ATDRS Advanced Tracking and Data Relay Satellite [Space]
ATF Advanced Technology Fighter
ATIS Atherton Tools Interface Specification
ATLAS Atmospheric Laboratory for Applications and Science [Space]
ATM Amateur Telescope Maker [Space]
ATM Asynchronous Transfer Mode
ATM Automatic Teller Machine
ATO Abort To Orbit [NASA, Shuttle]
ATO Abort To Orbit (Shuttle abort plan) [Space]
ATOMS AT&t Optimized Materials Simulator
ATP Adenosine TriPhosphate
ATPCO Airline Tariff Publishing COmpany
AT&T American Telephone & Telegraph [Corporate name]
ATT American Telephone & Telegraph (normally written AT&T when seperate)
ATTIS American Telephone and Telegraph Information Systems [AT&T] (Division)
ATV All Terrain Vehicle
AU Astronomical Unit (93,000,000 miles) [Space]
AU Astronomical Unit [Space]
AUI Attachment Universal Interface
AURA Association of Universities for Research in Astronomy [Space]
AUS Army of the United States
AUTODIN AUTOmatic DIgital Network
AUTOVON AUTOmatic VOice Network
AV AudioVisual
AVLIS Atomic Vapor Laser Isotope Separation
AWACS Airborne Warnings And Control Systems
AWEA American Wind Energy Association
AWK al Aho, peter Weinberger, brian Kernighan (pattern scanning language)
AWOL Absent WithOut Leave (also Absent Without Official Leave) (see AOL)
AW&ST Aviation Week and Space Technology (a.k.a. AvLeak) [Space]
AXAF Advanced X-ray Astrophysics Facility [Space]
AZ Arizona
B Book
B8ZS Binary 8 Zero Substitution (see also NRZ, NRZI, AMI)
BA Bachelor of Arts
BACH Business Alliance for Commerce in Hemp
BAFO Best And Final Offer
BARRNet Bay Area Regional Research Network (SF Bay Area)
BASIC Beginner's All-purpose Symbolic Instruction Code
BATSE Burst And Transient Source Experiment (on GRO) [Space]
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, Inc. [Corporate name]
BBXRT Broad-Band X-Ray Telescope (ASTRO package) [Space]
BC Battlecars
BC Before Christ
BC British Columbia
BC/BS Blue Cross/Blue Shield
BCD Bad Conduct Discharge
BCD Binary Coded Decimal
BCDIC Binary Coded Decimal Interchange Code
BCE Before the Common Era (substitute for BC)
BCNU Be Seeing You [Net jargon]
BCP Byte Controlled Protocols
BCPL Basic Combined Programming Language
BCS Bachelor of Commercial Science
BCS Binary Compatibility Standard
BCS Boston Computer Society
BCS British Computer Society
BD Bachelor of Divinity
BD Bank Draft
BD Bills Discounted
BD&D Basic Dungeons & Dragons
BDF Binary Distribution Format
BDT Billing Data Transmitter
BE Bill of Exchange
BEF British Expeditionary Force (see AEF)
BELCORE BELL COmmunications REsearch
BEM Bug Eyed Monster
BEM Bug-Eyed Monster [Space]
BENELUX BElgium, NEtherlands, and LUXembourg
BER Bit Error Rate
BERT Bit Error Rate Test
BEST Borland Enhanced Support and Training
BF Brought Forward
BFA Bachelor of Fine Arts
BFD Bristol (RI) Fire Department (probably typical of any town starting "B")
BH Black Hole [Space]
BH Boot Hill
BHP Brake HorsePower
BICS Building Industry Consulting Services [Telephony]
BID Bis In Die (twice a day)
BIMA Berkeley Illinois Maryland Array [Space]
BIOS Basic Input Output System
BIS Business Information System
BISDN Broadband ISDN (q.v.) [Telephony]
BiSync Binary Synchronous Communications (BSC is preferred) [IBM]
Bit BInary digiT
BITNET Because It's Time Network
BLAST BLocked ASynchronous Transmission
BLERT BLock Error Rate Test
BLF Busy Lamp Field [Telephony]
BLT Bacon, Lettuce, and Tomato (sandwich)
BLT BLock Transfer [Instruction]
BLT Branch Less Than [Instruction]
BM Basal Metabolism
BM Bowel Movement
BMA Bank Marketing Association
BMEWS Ballistic Missile Early Warning
BMO Ballistic Missile Office
BMOC Big Man On Campus
BMR Basal Metabolism Rate
BNC Bayonet Neill Concelman (connector) [Electronics] (see also TNC)
BNF Bachus-Naur Form
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
BOOTP Bootstrap Protocol [Internet]
BOQ Bachelor Officers' Quarters
BOS Business Office Supervisor
BOSIX Biin Open System Interface eXtension
BP Blood Pressure
BP British Petroleum
BP British Pharmacopoeia
BPI Bits Per Inch
BPL Boston Public Library
BPL Branch if PLus [Instruction]
BPOE Benevolent and Protective Order of Elks
BPS Bits Per Second
BR Bills Receivable
BR British Rail
BRA Boston Redevelopment Authority
BRI Basic Rate Interface (ISDN) [Telephony]
BRIEF Basic Reconfigurable Interactive Editing Facility
BRL army Ballistic Research Laboratory
BRS Bibliographic Retrieval Service
BS Bachelor of Science
BS Bill of Sale
BSA Birmingham Small Arms
BSA Boy Scouts of America
BSc Bachelor of SCience
BSC Binary Synchronous Communications (also sometimes BiSync) [IBM]
BSD Berkeley Software Distribution
BSN Bachelor of Science in Nursing
BSS Block Started by Symbol
BSTJ Bell System Technical Journal
BT British Telecom
BTAM Basic Telecommunications Access Method [IBM]
BThU British Thermal Unit (BTU {q.v.} is preferred)
BTL Bell Telephone Laboratories
BTO Bachman Turner Overdrive
BTU British Thermal Unit
BTW By The Way [Net jargon]
BU Boston University
BUF B-52 bomber ("Big Ugly Fellow") [USAF]
BV Blessed Virgin
BWI Baltimore-Washington International (airport)
BWI British West Indies
BX Base eXchange (see also PX)
c centi- (metric 1/100)
C programming language (successor to B, which was based on BCPL)
CA California
CA Chartered Accountant
CA Chief Accountant
CA Chronological Age
CA Collision Avoidance (as in CSMA/CA (q.v.))
CAB Civil Aeronautics Board
CACM Communications of the Association for Computing Machinery
CAD Computer Aided Design (sometimes seen as CAD/CAM)
CAD Computer Aided Dispatching
CAE Common Applications Environment
CAE Computer Aided Engineering
CAI Computer Aided Instruction
CAIS Common Apse Interface Specification
CALS Computer-aided Acquisition and Logistics Support
CAM Computer Aided Management
CAM Computer Aided Manufacturing (sometimes seen as CAD/CAM)
CAM Content Addressable Memory
CAMA Centralized Automatic Message Accounting [Telephony]
CAMP Campaign Against Marijuana Planting
CAP Civil Air Patrol
CAP Columbia Appletalk Package
CAR Contents of the Address part of the Register (LISP)
CARE Committee on American Relief in Europe
CARP California Air Resources Board
CASE Computer Aided Software Engineering
CASSIS Classification and Search Support Information System
CAT Computer-Aided Tomography
CATIS Common Applications and Tools Integration Services
CATV Common Antenna TeleVision
CATV Community Antenna TeleVision
CAVU Ceiling And Visibility Unlimited
CB Citizens Band radio
CBC Canadian Broadcasting Corporation
CBD Cash Before Delivery
CBD Commerce Business Daily
CBEMA Computer & Business Equipment Manufacturers Association
CBR Chemical, Biological, Radiological warfare
CBS Columbia Broadcasting System [Corporate name]
CBW Chemical and Biological Warfare
CC C (language) Compiler
CC Carbon Copy
CCA Computer Corporation of America [Corporate name]
CCAFS Cape Canaveral Air Force Station [Space]
CCC Canadian Committee on Cataloging
CCC Civil(ian) Conservation Corps
CCC Command, Control, and Communications (sometimes C^3)
CCC Concourse Computer Center [MIT]
CCCCM CCC CounterMeasures (sometimes C^3CM)
CCCI Command, Control, Communications, and Intelligence
CCD Charge Coupled Device (see CID)
CCD Charge-Coupled Device [Space]
CCDS Centers for the Commercial Development of Space [Space]
CCF Hundred Cubic Feet
CCI Computer Carrier Interrupt
CCI Computer Consoles, Incorporated
CCIP Continuously Computed Impact Point
CCIRN Coordinating Committee for Intercontinental Research Networking
CCIS Common Channel Interoffice Signaling [Telephony]
CCITT Comite' Consultatif International Telegraphique et Telephonique
CCITT Consultative Committee on International Telephony and Telegraphy
CCITT International Telegraph and Telephone Consultative Committee
CCR Commitment, Concurrency, and Recovery
CCR Creedence Clearwater Revival [Music]
CCRI Community College of Rhode Island [Corporate name]
CCRP Continuously Computed Release Point
CCS Hundred Call Seconds [Telephony]
CCS7 Common Channel Signalling (version #7) [Telephony, AT&T]
CCSA Common Control Switching Arrangement [Telephony]
CCTA Central Computer and Telecommunications Agency
CCTV Closed Circuit TeleVision
CD Carrier Detect (properly DCD (q.v.)) (EIA RS-232-C)
CD Certificate of Deposit
CD Civil Defense
CD Collision Detection (as in CSMA/CD (q.v.))
CD Compact Disk
CDA Call Data Accumulator
CDA Compound Documents Architecture
CDC Centers for Disease Control
CDC Control Data Corporation, Inc. [Corporate name]
CDEV Control panel DEVice
CDIAC Carbon Dioxide Information Analysis Center
CDO Community Dial Office
CDR CommanDeR
CDR Contents of the Decrement part of the Register (LISP)
CD-ROM Compact Disk Read Only Memory
CD-ROM Compact Disk Read-Only Memory [Space]
CDSF Commercially Developed Space Facility
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 (see also FE, SE)
CEA Commissariat a l'Energie Atomique (Frenc Atomic Energy Commision)
CEA Council of Economic Advisors
CEA County Education Authority
CEC Commission of the European Communities
CED Committee for Economic Development
CELSS Controlled Ecological Life Support System [Space]
CENS Centre d'Etudes Nucleaires de Seclay
CENTO CENtral Treaty Organization
CEO Chief Executive Officer
CERFnet California Education and Research Federation Network
CERN European Organization for Nuclear Research
CERN organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires
CERT Computer Emergency Response Team
CEVI Common Equipment Voltage Indicator
CF Carry Forward
CF Coin First (payphone) [Telephony]
CF Cystic Fibrosis [Disease]
CFA Center For Astrophysics [Space]
CFC Chloro-FluoroCarbon [Chemical]
CFC Combined Federal Campaign
CFD Computational Fluid Dynamics
CFHT Canada-France-Hawaii Telescope [Space]
CFI Cost, Freight, and Insurance
CFL Canadian Football League
CFO Chief Financial Officer
CG Coast Guard
CG Commanding General
CGA Color Graphics Adapter
CGCT Compagnie Generale de Constructions Telephoniques
CG&E Cincinnati Gas & Electric
CGE Compagnie Generale d'Electricite
CH Cardboard Heroes
CH ClearingHouse
CH CourtHouse
CH Customs House
CHA Champions
CHAP CHAnnel Processor
CHARA Center for High Angular Resolution Astronomy [Space]
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]
CIA Culinary Institute of America (Hyde Park, NY)
CIC Carrier Identification Codes [Telephony] (10XXX codes)
CIC Committee on Institutional Cooperation
CIC Coordination and Information Center [CSNet]
CICA Competition in Contracting Act
CICS Customer Information Control System [IBM]
CID Caller ID [Telephony] (see also: CLID, ANI)
CID Central Institute for the Deaf
CID Charge Injection Device (see CCD)
CID Computer Integrated Design
CIDIN Common Icao Data Interchange Network
CIM Computer Integrated Manufacturing
CIO Chief Information Officer
CIRRIS Cryogenic InfraRed Radiance Instrument for Shuttle [Space]
CISC Complex Instruction Set Computer
Cislunar The space between the Earth and the Moon
CIT California Institute of Technology
CIT Case Institute of Technology (part of CWRU, Cleveland, OH)
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