| The most common ones |
| AC current | Alternating Current current |
| ATM machine | Automated Teller Machine machine |
| DAT tape | Digital Audio Tape tape |
| DC current | Direct Current current |
| HIV virus | Human Immunodeficiency Virus virus |
| IRA account | Individual Retirement Account account |
| LAN network | Local Area Network network |
| LCD display | Liquid Crystal Display display |
| PIN number | Personal Identification Number number |
| RF frequency | Radio Frequency frequency |
| SALT talks | Strategic Arms Limitation Talks talks |
| UPC code | Universal Product Code code |
| |
| Less common ones: |
| AFC conference | American Football Conference conference |
| ARM mortgage | Adjustable Rate Mortgage mortgage |
| BBS system | Bulletin Board System system |
| CGA adapter | Color Graphics Adapter adapter |
| CPI index | Consumer Price Index index |
| DC Comics | Detective Comics Comics |
| DOS system | Disk Operating System system |
| EGA adapter | Enhanced Graphics Adapter adapter |
| GIF format | Graphic Interchange Format format |
| GOB Bluth | George Oscar Bluth Bluth
(a character from the TV show Arrested Development) |
| IBM machines | International Business Machines machines |
| IRC chat | Internet Relay Chat chat |
| ISBN number | International Standard Book Number number |
| KFC chicken | Kentucky Fried Chicken chicken |
| LPG gas | Liquid Propane Gas gas |
| MASH hospital | Mobile Army Surgical Hospital hospital |
| MIDI interface | Musical Instrument Digital Interface interface |
| NFC conference | National Football Conference conference |
| NPR radio | National Public Radio radio |
| OPEC countries | Organization of Petroleum Exporting Countries countries |
| PDF format | Portable Document Format format |
| POST test | Power On Self Test test |
| RAM memory | Random Access Memory memory |
| RISC computer | Reduced Instruction Set Computer computer |
| ROM memory | Read Only Memory memory |
| RPN notation | Reverse Polish Notation notation |
| SAT test | Scholastic Assessment (Aptitude) Test test |
| SAM missile | Surface-to-Air Missile missile |
| START talks | Strategic Arms Reduction Talks talks |
| START treaty | Strategic Arms Reduction Treaty treaty |
| TWA airlines | Trans World Airlines airlines |
| UL laboratories | Underwriters Laboratories laboratories |
| USGS survey | United States Geological Survey survey |
| VAT tax | Value Added Tax tax |
| VGA adapter | Variable Graphics Adapter adapter |
| VIN number | Vehicle Identification Number number |
| |
| Special cases: |
| RAP phrase | Redundant Acronym Phrase phrase |
| RAS syndrome | Redundant Acronym Syndrome syndrome |
| PNS syndrome | PIN Number Syndrome syndrome |
| | (Personal Identification Number Number Syndrome syndrome) |
| |
| Some more obscure ones: |
| ADD disorder | Attention Deficit Disorder disorder |
| AIDS syndrome | Acquired Immune Deficiency Syndrome syndrome |
| AM modulation | Amplitude Modulation modulation |
| ATC control | Air Traffic Control control |
| CD disc | Compact Disc disc |
| COBOL language | Common Business-Oriented Language language |
| CPU unit | Central Processing Unit unit |
| CS/DS/ES/SS segment | Code/Data/Extra/Stack Segment segment |
| EBCDIC code | Extended Binary Coded Decimal Interchange Code code |
| FM modulation | Frequency Modulation modulation |
| HTML language | Hyper Text Markup Language language |
| IP pointer | Instruction Pointer pointer |
| LEM module | Lunar Excursion Module module |
| PC circuit | Printed Circuit circuit |
| PERL language | Practical Extraction and Reporting Language language |
| PIF file | Program Information File file |
| UHF frequency | Ultra-High Frequency frequency |
| UN nations | United Nations nations |
| UNIVAC computer | Universal Automatic Computer computer |
| UPI international | United Press International international |
| VHF frequency | Very High Frequency frequency |