The Ultimate List of 1000 Abbreviations (A-Z Complete Guide)
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Abbreviations are shortened forms of words or phrases used for convenience in writing and communication. Whether you’re a student, professional, or just curious about language, this comprehensive list of 1000 abbreviations will help you understand commonly used terms across different fields.
Why Learn Abbreviations?
Abbreviations make communication faster and more efficient. They are widely used in:
✔ Business & Finance (CEO, ROI, GDP)
✔ Technology (AI, HTML, CPU)
✔ Medicine (DNA, ICU, WHO)
✔ Education (PhD, MBA, STEM)
✔ Everyday Conversations (LOL, ASAP, FYI)
Below is an alphabetical list of 1000 abbreviations with their full forms.
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Here are The Ultimate List of 1000 Abbreviations (A-Z Complete Guide)
A
- D.– Anno Domini (in the year of our Lord)
- M.– Ante Meridiem (before noon)
- AA– Alcoholics Anonymous
- AAA– American Automobile Association
- AARP– American Association of Retired Persons
- AB– Able Bodied (seaman)
- ABC– American Broadcasting Company
- ABS– Anti-lock Braking System
- AC– Alternating Current
- ACLU– American Civil Liberties Union
- ADHD– Attention Deficit Hyperactivity Disorder
- AFAIK– As Far As I Know
- AIDS– Acquired Immune Deficiency Syndrome
- AKA– Also Known As
- AL– Alabama
- AM– Amplitude Modulation
- AMA– American Medical Association
- AP– Associated Press
- API– Application Programming Interface
- APR– Annual Percentage Rate
- AR– Arkansas
- ASAP– As Soon As Possible
- ASCII– American Standard Code for Information Interchange
- ASL– American Sign Language
- ATM– Automated Teller Machine
- AUD– Australian Dollar
- AV– Audio Visual
- AWOL– Absent Without Leave
- AZ– Arizona
B
- A.– Bachelor of Arts
- S.– Bachelor of Science
- BA– British Airways
- B2B– Business to Business
- B2C– Business to Consumer
- BAE– Before Anyone Else
- BBC– British Broadcasting Corporation
- BC– Before Christ
- BCE– Before Common Era
- BFF– Best Friends Forever
- BGM– Background Music
- BHP– Brake Horsepower
- BIOS– Basic Input Output System
- BLT– Bacon, Lettuce, and Tomato
- BMI– Body Mass Index
- BMR– Basal Metabolic Rate
- BP– Blood Pressure
- BRB– Be Right Back
- BRO– Brother
- BS– Bachelor of Science
- BTW– By The Way
- BYOB– Bring Your Own Bottle/Beer
- B2B– Business to Business
- B2C– Business to Consumer
- B2G– Business to Government
- B2E– Business to Employee
- B4– Before
- B4N– Bye For Now
- BAK– Back at Keyboard
- BAM– Bosnia and Herzegovina Convertible Mark
- BBL– Be Back Later
C
- E.– Common Era
- CA– California
- CAD– Computer-Aided Design
- CAL– Computer-Aided Learning
- CAPTCHA– Completely Automated Public Turing test to tell Computers and Humans Apart
- CAT– Computerized Axial Tomography
- CBS– Columbia Broadcasting System
- CC– Carbon Copy
- CD– Compact Disc
- CD-ROM– Compact Disc Read-Only Memory
- CEO– Chief Executive Officer
- CFO– Chief Financial Officer
- CGI– Computer Generated Imagery
- CHF– Swiss Franc
- CIA– Central Intelligence Agency
- CID– Criminal Investigation Department
- CIS– Commonwealth of Independent States
- CL– Chile
- CM– Centimeter
- CNN– Cable News Network
- CO– Colorado
- COD– Cash on Delivery
- COO– Chief Operating Officer
- CPA– Certified Public Accountant
- CPR– Cardiopulmonary Resuscitation
- CPU– Central Processing Unit
- CRT– Cathode Ray Tube
- CS– Computer Science
- CST– Central Standard Time
- CT– Connecticut
- CV– Curriculum Vitae
- CW– Clockwise
- CYA– See You Around
D
- DA– District Attorney
- DBA– Doing Business As
- DC– District of Columbia
- DDS– Doctor of Dental Surgery
- DE– Delaware
- DIY– Do It Yourself
- DJ– Disc Jockey
- DM– Direct Message
- DNA– Deoxyribonucleic Acid
- DOA– Dead On Arrival
- DOB– Date of Birth
- DOD– Department of Defense
- DOE– Department of Energy
- DOT– Department of Transportation
- DP– Display Picture
- DPI– Dots Per Inch
- DR– Doctor
- DSLR– Digital Single-Lens Reflex
- DUI– Driving Under Influence
- DVD– Digital Versatile Disc
- DVR– Digital Video Recorder
- DWI– Driving While Intoxicated
E
- g.– Exempli Gratia (for example)
- EAP– Employee Assistance Program
- EBAY– Echo Bay (original name)
- ECG– Electrocardiogram
- EDT– Eastern Daylight Time
- EEC– European Economic Community
- EKG– Electrocardiogram (German spelling)
- EMI– Equated Monthly Installment
- EMT– Emergency Medical Technician
- EOD– End Of Day
- EOM– End Of Message
- EPA– Environmental Protection Agency
- ERP– Enterprise Resource Planning
- ESL– English as Second Language
- EST– Eastern Standard Time
- ETA– Estimated Time of Arrival
- ETC– Et Cetera (and so on)
- EU– European Union
- EV– Electric Vehicle
- EW– Electronic Warfare
F
- FAQ– Frequently Asked Questions
- FBA– Fulfillment By Amazon
- FBI– Federal Bureau of Investigation
- FBO– Facebook Official
- FDA– Food and Drug Administration
- FEMA– Federal Emergency Management Agency
- FF– Follow Friday (Twitter)
- FIFA– Fédération Internationale de Football Association
- FIFO– First In First Out
- FOMO– Fear Of Missing Out
- FPS– Frames Per Second
- FR– For Real
- FTP– File Transfer Protocol
- FWIW– For What It’s Worth
- FYI– For Your Information
G
- GA– Georgia
- GAAP– Generally Accepted Accounting Principles
- GBA– Game Boy Advance
- GBP– Great British Pound
- GC– Graphics Card
- GDP– Gross Domestic Product
- GED– General Educational Development
- GF– Girlfriend
- GIF– Graphics Interchange Format
- GMO– Genetically Modified Organism
- GMT– Greenwich Mean Time
- GOP– Grand Old Party (Republican Party)
- GPA– Grade Point Average
- GPS– Global Positioning System
- GPU– Graphics Processing Unit
- GRE– Graduate Record Examination
- GST– Goods and Services Tax
- GTG– Got To Go
- GUI– Graphical User Interface
- GWS– Get Well Soon
H
- HA– Hawaii
- HD– High Definition
- HDD– Hard Disk Drive
- HDMI– High-Definition Multimedia Interface
- HOA– Homeowners Association
- HOV– High Occupancy Vehicle
- HR– Human Resources
- HTML– HyperText Markup Language
- HTTP– HyperText Transfer Protocol
- HVAC– Heating, Ventilation and Air Conditioning
- Hz– Hertz (frequency)
I
- e.– Id Est (that is)
- IBM– International Business Machines
- IC– Integrated Circuit
- ICE– In Case of Emergency
- ICU– Intensive Care Unit
- ID– Identification
- IDK– I Don’t Know
- IEEE– Institute of Electrical and Electronics Engineers
- IELTS– International English Language Testing System
- IM– Instant Message
- IMO– In My Opinion
- IOW– In Other Words
- IQ– Intelligence Quotient
- IRA– Individual Retirement Account
- IRL– In Real Life
- IRS– Internal Revenue Service
- ISBN– International Standard Book Number
- ISP– Internet Service Provider
- IT– Information Technology
J
- D.– Juris Doctor (Law Degree)
- JPEG– Joint Photographic Experts Group
- JS– JavaScript
- JSON– JavaScript Object Notation
- JV– Joint Venture
K
- K– Thousand (from Greek “kilo”)
- K9– Canine (Police Dog Unit)
- KB– Kilobyte
- KPI– Key Performance Indicator
- KW– Kilowatt
L
- A.– Los Angeles
- LAN– Local Area Network
- LCD– Liquid Crystal Display
- LED– Light Emitting Diode
- LGBTQ+– Lesbian, Gay, Bisexual, Transgender, Queer/Questioning
- LLC– Limited Liability Company
- LOL– Laugh Out Loud
- LTE– Long-Term Evolution
- LZ– Landing Zone
M
- A.– Master of Arts
- MBA– Master of Business Administration
- MD– Doctor of Medicine
- MIA– Missing In Action
- MIT– Massachusetts Institute of Technology
- MMR– Measles, Mumps, Rubella (Vaccine)
- MO– Modus Operandi
- MOOC– Massive Open Online Course
- MP– Member of Parliament
- MP3– MPEG-1 Audio Layer 3
- MPG– Miles Per Gallon
- MRI– Magnetic Resonance Imaging
- MS– Master of Science
- MSG– Monosodium Glutamate
- MTV– Music Television
- MVP– Most Valuable Player
N
- NAACP– National Association for the Advancement of Colored People
- NASA– National Aeronautics and Space Administration
- NATO– North Atlantic Treaty Organization
- NBA– National Basketball Association
- NCAA– National Collegiate Athletic Association
- NFL– National Football League
- NGO– Non-Governmental Organization
- NICU– Neonatal Intensive Care Unit
- NIMBY– Not In My Backyard
- NPR– National Public Radio
- NSA– National Security Agency
- NSFW– Not Safe For Work
- NYS– New York State
O
- D.– Doctor of Optometry
- OEM– Original Equipment Manufacturer
- OG– Original Gangster
- OH– Ohio
- OMG– Oh My God
- OS– Operating System
- OTC– Over The Counter
- OTT– Over The Top (media services)
- OZ– Ounce
P
- A.– Personal Assistant
- PA– Pennsylvania
- PAC– Political Action Committee
- PAL– Phase Alternating Line (TV system)
- PAS– Public Address System
- PC– Personal Computer
- PDA– Public Display of Affection
- PDF– Portable Document Format
- PE– Physical Education
- PEG– Percutaneous Endoscopic Gastrostomy
- D.– Doctor of Philosophy
- PIN– Personal Identification Number
- PJ– Pyjamas
- POTUS– President of the United States
- POV– Point Of View
- PR– Public Relations
- PS– Post Script
- PSA– Prostate-Specific Antigen
- PST– Pacific Standard Time
- PT– Physical Therapy
- PTO– Paid Time Off
- PVC– Polyvinyl Chloride
Q
- QA– Quality Assurance
- QC– Quality Control
- Q&A– Question and Answer
- QOL– Quality Of Life
- QR– Quick Response (code)
R
- R&D– Research and Development
- RAM– Random Access Memory
- RBI– Reserve Bank of India
- RFID– Radio Frequency Identification
- RIP– Rest In Peace
- RNA– Ribonucleic Acid
- ROFL– Rolling On Floor Laughing
- ROI– Return On Investment
- ROM– Read Only Memory
- RPM– Revolutions Per Minute
- RSVP– Répondez S’il Vous Plaît (please respond)
- RT– Retweet
- RTC– Real Time Clock
- RV– Recreational Vehicle
- Rx– Prescription
S
- W.A.T.– Special Weapons And Tactics
- SAE– Society of Automotive Engineers
- SAP– Systems, Applications, Products
- SARS– Severe Acute Respiratory Syndrome
- SC– South Carolina
- SCUBA– Self-Contained Underwater Breathing Apparatus
- SD– South Dakota
- SDR– Special Drawing Rights
- SE– Southeast
- SEO– Search Engine Optimization
- SMS– Short Message Service
- SOP– Standard Operating Procedure
- SOS– Save Our Souls
- SPF– Sun Protection Factor
- SQL– Structured Query Language
- SSN– Social Security Number
- STD– Sexually Transmitted Disease
- SUV– Sports Utility Vehicle
- SW– Southwest
T
- TB– Tuberculosis
- TBA– To Be Announced
- TBD– To Be Determined
- TEFL– Teaching English as a Foreign Language
- TGIF– Thank God It’s Friday
- TIA– Thanks In Advance
- TLC– Tender Loving Care
- TM– Trademark
- TMI– Too Much Information
- TN– Tennessee
- TNT– Trinitrotoluene (explosive)
- TOEFL– Test of English as a Foreign Language
- TTYL– Talk To You Later
- TV– Television
- TXT– Text
U
- UAE– United Arab Emirates
- UFO– Unidentified Flying Object
- UGC– User Generated Content
- UK– United Kingdom
- UN– United Nations
- UNESCO– United Nations Educational, Scientific and Cultural Organization
- UNICEF– United Nations International Children’s Emergency Fund
- UPS– Uninterruptible Power Supply
- URL– Uniform Resource Locator
- USB– Universal Serial Bus
- USP– Unique Selling Proposition
- UT– Utah
V
- VA– Virginia
- VAT– Value Added Tax
- VCR– Video Cassette Recorder
- VIP– Very Important Person
- VISA– Visa International Service Association
- VLOG– Video Blog
- VPN– Virtual Private Network
- VR– Virtual Reality
- VS– Versus
- VT– Vermont
W
- WAN– Wide Area Network
- WAP– Wireless Application Protocol
- WB– Warner Bros.
- WC– Water Closet (toilet)
- WHO– World Health Organization
- WiFi– Wireless Fidelity
- WIP– Work In Progress
- WWE– World Wrestling Entertainment
- WWW– World Wide Web
X
- XOXO– Hugs and Kisses
- XML– Extensible Markup Language
- XRAY– X-radiation
Y
- YOLO– You Only Live Once
- YTD– Year To Date
- Y2K– Year 2000
Z
- ZIP– Zone Improvement Plan
- ZOO– Zoological Garden
Medical (373-422)
- ABG– Arterial Blood Gas
- ACL– Anterior Cruciate Ligament
- ADL– Activities of Daily Living
- AED– Automated External Defibrillator
- ALS– Amyotrophic Lateral Sclerosis
- BID– Bis In Die (twice daily)
- BLS– Basic Life Support
- BMI– Body Mass Index
- BPH– Benign Prostatic Hyperplasia
- BPM– Beats Per Minute
- CBC– Complete Blood Count
- CDC– Centers for Disease Control
- CHF– Congestive Heart Failure
- COPD– Chronic Obstructive Pulmonary Disease
- CPAP– Continuous Positive Airway Pressure
- DNR– Do Not Resuscitate
- DVT– Deep Vein Thrombosis
- ECG/EKG– Electrocardiogram
- ED– Emergency Department
- EEG– Electroencephalogram
- EMG– Electromyogram
- ENT– Ear, Nose, and Throat
- ER– Emergency Room
- FBS– Fasting Blood Sugar
- GFR– Glomerular Filtration Rate
- GI– Gastrointestinal
- GTT– Glucose Tolerance Test
- HDL– High-Density Lipoprotein
- HR– Heart Rate
- ICU– Intensive Care Unit
- IM– Intramuscular
- IOP– Intraocular Pressure
- IV– Intravenous
- LDL– Low-Density Lipoprotein
- LP– Lumbar Puncture
- MRI– Magnetic Resonance Imaging
- NPO– Nil Per Os (nothing by mouth)
- NSAID– Non-Steroidal Anti-Inflammatory Drug
- OR– Operating Room
- OTC– Over-the-Counter
- PCP– Primary Care Physician
- PE– Pulmonary Embolism
- PICC– Peripherally Inserted Central Catheter
- PRN– Pro Re Nata (as needed)
- PT– Physical Therapy
- RBC– Red Blood Cell
- SOB– Shortness of Breath
- STAT– Immediately
- TIA– Transient Ischemic Attack
- WBC– White Blood Cell
Technology (423-522)
- AI– Artificial Intelligence
- API– Application Programming Interface
- BIOS– Basic Input/Output System
- CAD– Computer-Aided Design
- CDN– Content Delivery Network
- CMS– Content Management System
- CSS– Cascading Style Sheets
- DHCP– Dynamic Host Configuration Protocol
- DNS– Domain Name System
- DoS– Denial of Service
- DPI– Dots Per Inch
- DRM– Digital Rights Management
- ERP– Enterprise Resource Planning
- FTP– File Transfer Protocol
- GPU– Graphics Processing Unit
- GUI– Graphical User Interface
- HDD– Hard Disk Drive
- HTML– HyperText Markup Language
- HTTP– HyperText Transfer Protocol
- HTTPS– HyperText Transfer Protocol Secure
- I/O– Input/Output
- IDE– Integrated Development Environment
- IoT– Internet of Things
- IP– Internet Protocol
- ISP– Internet Service Provider
- IT– Information Technology
- LAN– Local Area Network
- LCD– Liquid Crystal Display
- LED– Light Emitting Diode
- MAC– Media Access Control
- MFA– Multi-Factor Authentication
- NAS– Network Attached Storage
- OCR– Optical Character Recognition
- OS– Operating System
- PDF– Portable Document Format
- PHP– Hypertext Preprocessor
- PNG– Portable Network Graphics
- RAM– Random Access Memory
- ROM– Read Only Memory
- RSS– Really Simple Syndication
- SaaS– Software as a Service
- SDK– Software Development Kit
- SEO– Search Engine Optimization
- SSD– Solid State Drive
- SSL– Secure Sockets Layer
- TCP– Transmission Control Protocol
- UI– User Interface
- URL– Uniform Resource Locator
- USB– Universal Serial Bus
- UX– User Experience
- VGA– Video Graphics Array
- VPN– Virtual Private Network
- VR– Virtual Reality
- WAN– Wide Area Network
- WiFi– Wireless Fidelity
- XML– Extensible Markup Language
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Militry (523-572)
- AA– Anti-Aircraft
- AWOL– Absent Without Leave
- CBRN– Chemical, Biological, Radiological, Nuclear
- CO– Commanding Officer
- DOD– Department of Defense
- EOD– Explosive Ordnance Disposal
- FOB– Forward Operating Base
- IED– Improvised Explosive Device
- KIA– Killed In Action
- MIA– Missing In Action
- MP– Military Police
- NCO– Non-Commissioned Officer
- POW– Prisoner of War
- PT– Physical Training
- ROTC– Reserve Officers’ Training Corps
- SOP– Standard Operating Procedure
- TDY– Temporary Duty
- USAF– United States Air Force
- USMC– United States Marine Corps
- USN– United States Navy
Finance (573-622)
- APR– Annual Percentage Rate
- ARM– Adjustable Rate Mortgage
- CD– Certificate of Deposit
- CPA– Certified Public Accountant
- ETF– Exchange-Traded Fund
- FDIC– Federal Deposit Insurance Corporation
- IRA– Individual Retirement Account
- LLC– Limited Liability Company
- NASDAQ– National Association of Securities Dealers Automated Quotations
- NYSE– New York Stock Exchange
- P/E– Price-to-Earnings Ratio
- ROI– Return on Investment
- SEC– Securities and Exchange Commission
- S&P– Standard & Poor’s
Education (623-672)
- ACT– American College Testing
- AP– Advanced Placement
- GED– General Educational Development
- GPA– Grade Point Average
- GRE– Graduate Record Examination
- IB– International Baccalaureate
- LSAT– Law School Admission Test
- MCAT– Medical College Admission Test
- PHD– Doctor of Philosophy
- SAT– Scholastic Assessment Test
- STEM– Science, Technology, Engineering, Mathematics
Government (673-722)
- CIA– Central Intelligence Agency
- DHS– Department of Homeland Security
- DOJ– Department of Justice
- EPA– Environmental Protection Agency
- FAA– Federal Aviation Administration
- FBI– Federal Bureau of Investigation
- FDA– Food and Drug Administration
- FEMA– Federal Emergency Management Agency
- IRS– Internal Revenue Service
- NASA– National Aeronautics and Space Administration
- NRC– Nuclear Regulatory Commission
- NSA– National Security Agency
- OSHA– Occupational Safety and Health Administration
- TSA– Transportation Security Administration
Science (723-772)
- DNA– Deoxyribonucleic Acid
- RNA– Ribonucleic Acid
- ATP– Adenosine Triphosphate
- pH– Potential of Hydrogen
- CO2– Carbon Dioxide
- H2O– Water
- N2O– Nitrous Oxide
- NaCl– Sodium Chloride
Sports (773-822)
- FIFA– Fédération Internationale de Football Association
- IOC– International Olympic Committee
- MLB– Major League Baseball
- NBA– National Basketball Association
- NFL– National Football League
- NHL– National Hockey League
- UFC– Ultimate Fighting Championship
Automotive (823-872)
- ABS– Anti-lock Braking System
- AWD– All-Wheel Drive
- CVT– Continuously Variable Transmission
- DOT– Department of Transportation
- EV– Electric Vehicle
- FWD– Front-Wheel Drive
- HP– Horsepower
- MPG– Miles Per Gallon
- RPM– Revolutions Per Minute
- SUV– Sports Utility Vehicle
- VIN– Vehicle Identification Number
Aviation (873-922)
- ATC– Air Traffic Control
- ETA– Estimated Time of Arrival
- FAA– Federal Aviation Administration
- IATA– International Air Transport Association
- ICAO– International Civil Aviation Organization
- PPL– Private Pilot License
- TSA– Transportation Security Administration
Miscellaneous (923-1000)
- DIY– Do It Yourself
- ETA– Estimated Time of Arrival
- FYI– For Your Information
- IMO– In My Opinion
- LOL– Laugh Out Loud
- OMG– Oh My God
- RSVP– Répondez S’il Vous Plaît
- TGIF– Thank God It’s Friday
- VIP– Very Important Person
- YOLO– You Only Live Once
General & Internet (932-960)
- YTD– Year to Date
- YW– You’re Welcome
- ZIP– Zone Improvement Plan
- 3G/4G/5G– 3rd/4th/5th Generation Wireless
- 24/7– 24 Hours a Day, 7 Days a Week
- 404– Not Found (Internet Error)
- 411– Information (US Directory Assistance)
- 911– Emergency Number (US)
- AMA– Ask Me Anything
- ASL– Age/Sex/Location
- B4– Before
- B4N– Bye For Now
- BDAY– Birthday
- BFFL– Best Friends For Life
- BRT– Be Right There
- BTW– By The Way
- CMON– Come On
- CTN– Can’t Talk Now
- CU– See You
- CUL– See You Later
- DAE– Does Anyone Else
- DM– Direct Message
- DWB– Driving While Black
- EM– Email
- FB– Facebook
- FWIW– For What It’s Worth
- GF– Girlfriend
- GM– Good Morning
- GN– Good Night
Business & Finance (961-980)
- B2B– Business to Business
- B2C– Business to Consumer
- CAPEX– Capital Expenditure
- COB– Close of Business
- CRM– Customer Relationship Management
- EBITDA– Earnings Before Interest, Taxes, Depreciation & Amortization
- FIFO– First In First Out
- GAAP– Generally Accepted Accounting Principles
- KPI– Key Performance Indicator
- LIFO– Last In First Out
- M&A– Mergers and Acquisitions
- NAV– Net Asset Value
- OPEX– Operating Expense
- P&L– Profit and Loss
- QC– Quality Control
- ROE– Return on Equity
- ROI– Return on Investment
- SME– Small and Medium Enterprise
- TQM– Total Quality Management
- VAT– Value Added Tax
Science & Technology (981-1000)
- API– Application Programming Interface
- CAD– Computer-Aided Design
- CMS– Content Management System
- CSS– Cascading Style Sheets
- DNS– Domain Name System
- FTP– File Transfer Protocol
- GUI– Graphical User Interface
- HTML– HyperText Markup Language
- HTTP– HyperText Transfer Protocol
- IoT– Internet of Things
- IP– Internet Protocol
- ISP– Internet Service Provider
- LAN– Local Area Network
- OS– Operating System
- RAM– Random Access Memory
- ROM– Read Only Memory
- SEO– Search Engine Optimization
- SSD– Solid State Drive
- URL– Uniform Resource Locator
- WWW– World Wide Web

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Categories Covered:
-
General Abbreviations (ASAP, FYI, RSVP)
-
Technology & IT (HTML, CPU, API)
-
Medical Terms (DNA, MRI, CPR)
-
Business & Finance (CEO, ROI, KPI)
-
Education (PhD, MBA, GPA)
-
Government & Military (FBI, CIA, NATO)
-
Internet & Social Media (DM, LOL, NSFW)
-
Sports & Entertainment (NBA, FIFA, ESPN)
This list serves as a quick reference guide for students, professionals, and anyone looking to understand common abbreviations.

