| Acronym | Meaning |
 | BOS | Battlefield Operating System |
| BOS | Bosnian Language (ISO 639-2 Code) |
| BOT | Balance Of Trade - Build Operate Transfer - Bank Of Thailand |
| BP | Battle Position - British Petroleum (today |
| BPD | Bipolar Personality Disorder |
| BPM | Beats Per Minute |
| BPV | Battlefield Planning Visualization - Bovine Papillomavirus |
| BQ | British Antarctic Territory (ISO 3166 Digram; Merged With AQ In 1979) - Navassa Island (FIPS 10-4 Territory Code) |
| BR | Brazil (ISO 3166 Digram; FIPS 10-4 Country Code) -British Rail- Break Ranks (marching Band Term) |
| BR | Breton Language (ISO 639-1 Code) |
| BR | Bromine |
| BRA | Brazil (ISO 3166 Trigram) |
| BRASS | Breathe |
| BRB | Barbados (ISO 3166 Trigram) -Be Right Back (Internet Chat Abbreviation) |
| BRDM | Boyevaya Razvedyvatelnaya Dosornaya Mashina (Russian ?????? ???????????????? ???????? ?????? |
| BRE | Breton Language (ISO 639-2 Code) |
| BRFSS | Behavioral Risk Factor Surveillance System (burf-us |
| BRI | Bathroom Readers Institute (publishers Of Series Of Uncle John's Bathroom Readers Books) |
| BRIC | Brazil |
| BRIMS | Behavior Representation In Modeling And Simulation (conference) |
| BRL | Brazilian Real (ISO 4217 Currency Code) |
| BRM | Boyevaya Razvedyvatelnaya Mashina (Russian ?????? ???????????????? ?????? |
| BRN | Brunei (ISO 3166 Trigram) |
| BRS | Battlefield Reasoning System |
| BS | Bosnian Language (ISO 639-1 Code) |
| BS | The Bahamas (ISO 3166 Digram) - Bassas Da India (FIPS 10-4 Territory Code) - Bachelor Of Science Degree - British Subject - Bullshit |
| BSA | Birmingham Small Arms (motorcycles Company) - Boy Scouts Of America - Brigade Support Area |
| BSD | Bahamian Dollar (ISO 4217 Currency Code) -Berkeley Software Distribution (distinct From BSoD) |
| BSE | Bovine Spongiform Encephalopathy |
| BSF | British Standard Fine (screw Thread) |
| BSL | British Sign Language |
| BSMB | British Society For Matrix Biology |
| BSN | Bachelor Of Science In Nursing |
| BSOD | Blue Screen Of Death (distinct From BSD) |
| BSP | Between-Show Promotion - Binary Space Partitioning - Board Support Package - British Standard Pipe (screw Thread) -Business-sponsored - Bone Sialoprotein |
| BST | Binary Search Tree - Blended Sales Tax -Bovine Somatotropin -British Summer Time |
| BSW | British Standard Whitworth (screw Thread) |
| BSX | Bendigo Stock Exchange |
| BT | Baronet; (ii) Bacillus Thuringiensis |
| BT | Bathythermograph -Bhutan (FIPS 10-4 Country Code; ISO 3166 Digram) - (ii) BitTorrent - (iii) British Telecommunications Plc |
| BTI | Bacillus Thuringiensis Israelensis |
| BTID | Battlefield Target Identification Device |
| BTIS | Battlefield Target Identification System |
| BTN | Bhutan (ISO 3166 Trigram) - Bhutanese Ngultrum (ISO 4217 Currency Code) |
| BTO | Built To Order |
| BTP | British Transport Police |
| BTR | Bronetransporter (??? = ???????????????? (Heavy) Armoured (Personnel) Transporter) ? |
| BTU | British Thermal Unit |
| BTW | By The Way |
| BU | Bulgaria (FIPS 10-4 Country Code) - Burma (ISO 3166 Digram; Obsolete Since 1989) |
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