| Acronym | Meaning |
 | BUAV | British Union For The Abolition Of Vivisection |
| BUG | E -Battlefield Universal Gateway Equipment (buggy) |
| BUL | Bulgarian Language (ISO 639-2 Code) |
| BUNO OR BUNO | Bureau Number (aircraft Serial Number) |
| BUR | Burma (ISO 3166 Trigram; Obsolete Since 1989) |
| BV | Background Vocals - Battlefield Visualization -Bouvet Island (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| BVD | Bradley |
| BVR | Beyond Visual Range |
| BVT | Bouvet Island (ISO 3166 Trigram) |
| BW | Botswana (ISO 3166 Digram) |
| BWA | Botswana (ISO 3166 Trigram) |
| BWARS | Bees |
| BWC | Biological And Toxin Weapons Convention |
| BWP | Botswanian Pula (ISO 4217 Currency Code) |
| BWR | Boiling-Water Reactor |
| BX | Base EXchange -Brunei (FIPS 10-4 Country Code) |
| BY | Burundi (FIPS 10-4 Country Code) - Belarus (ISO 3166 Digram) |
| BYOB | Bring Your Own Beer/Beverages/Bottle |
| BYOC | Bring Your Own Computer (play On BYOB) |
| BYOF | Bring Your Own Flask |
| BYR | Belarusian Ruble (ISO 4217 Currency Code) |
| BYS | Byelorussian Soviet Socialist Republic (ISO 3166 Trigram; Obsolete Since 1992) |
| BYU | Brigham Young University |
| BZ | Belize (ISO 3166 Digram) |
| BZD | Belize Dollar (ISO 4217 Currency Code) |
| BZP | Benzylpiperazine |
| B[A]P | Benzo[a]pyrene |
| C | Carbon - Coulomb - One Hundred (in Roman Numerals) |
| C | Centi |
| C/O | Care Of (postal Code Indicating Temporary Address Change) |
| C/S/A | CINC |
| C2 OR C? | Command And Control |
| C2C | Consumer-To-Consumer Electronic Commerce - Cam-To-Cam Internet Chat |
| C2C | The British Rail Company Formerly Known As LTS Rail |
| C2D OR C?D | Intel Core 2 Duo - CERDEC Command And Control Directorate |
| C2IEDM OR C?IEDM | Command And Control Information Exchange Data Model |
| C2IS OR C?IS | Command And Control Information System |
| C2PC OR C?PC | Command And Control Personal Computer |
| C2V OR C?V | Command And Control Vehicle |
| C2W OR C?W | Command And Control Warfare |
| C3 OR C? | Colorectal Cancer Condition - Command |
| C3I OR C?I | Command |
| C4 OR C? | Command |
| C4I OR C?I | Command |
| C4ISR OR C?ISR | Command |
| CA | Calcium |
| CA | California (postal Symbol) - Canada (FIPS 10-4 Country Code; ISO 3166 Digram) - Catalonia -Civil Affairs - Close Armour - Computer Associates - Counter-Air |
| CA | Catalan Language (ISO 639-1 Code) |
| CAA | Canadian Automobile Association - (NORAD) Center For Aerospace Analysis - (U.S.) Center For Army Analysis - (U.S.) Clean Air Act - (U.S. Army) Concepts Analysis Agency - Civil Aviation Authority - Colonial Athletic Association |
| CAAT | OrCampaign Against Arms Trade - The Johns Hopkins Center For Alternatives To Animal Testing |
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