| Acronym | Meaning |
 | BETS | Bradley Embedded Training System |
| BF | The Bahamas (FIPS 10-4 Country Code) - Burkina Faso (ISO 3166 Digram) |
| BFA | Burkina Faso (ISO 3166 Trigram) |
| BFF | Best Friends Forever |
| BFR | Brominated Flame Retardant |
| BFSA | Blue Force Situation Awareness |
| BG | Bangladesh (FIPS 10-4 Country Code) -Battle Group - Body Guard -Brigadier General -Bulgaria (ISO 3166 Digram) |
| BG | Bulgarian Language (ISO 639-1 Code) |
| BGA | Ball Grid Array - Brandy And Ginger Ale (alcoholic Beverage) |
| BGD | Bangladesh (ISO 3166 Trigram) |
| BGN | U.S. Board On Geographic Names -Bulgarian Lev (ISO 4217 Currency Code) |
| BGR | Bulgaria (ISO 3166 Trigram) |
| BGS | Bristol Grammar School - British Geographical Survey |
| BGWG | Battle Group Wargame (military Simulation; Big Wig) |
| BH | Bahrain (ISO 3166 Digram) - Belize (FIPS 10-4 Country Code) |
| BH | Bihari Languages (ISO 639-1 Code) |
| BH | Bohrium |
| BHD | Bahraini Dinar (ISO 4217 Currency Code) |
| BHR | Bahrain (ISO 3166 Trigram) |
| BHS | British Home Stores |
| BHS | The Bahamas (ISO 3166 Trigram) |
| BI | Bislami Language (ISO 639-1 Code) |
| BI | Bismuth |
| BI | Burundi (ISO 3166 Digram) |
| BIAP | Baghdad International Airport -Biafran Pound |
| BICS | Battlefield Information And Communication System |
| BID | Bis In Die (Latin |
| BIDST | British Institute Of Dental And Surgical Technologists |
| BIF | Burundian Franc (ISO 4217 Currency Code) |
| BIH | Bihari Languages (ISO 639-2 Code) |
| BIH | Bosnia And Herzegovina (ISO 3166 Trigram) |
| BIOS | Basic Input/Output System - British Institute Of Organ Studies |
| BIP | Battlefield Interoperability Programme (ancestor Of MIP) - Boys Into Party (musical Group) |
| BIS | Bislami Language (ISO 639-2 Code) |
| BISEPS | Battlefield Identification System Environment Performance Simulation |
| BIST | Built-In Self-Test |
| BIT | Bilateral Investment Treaty - Built-In Test |
| BITE | Built-In Test Equipment |
| BJ | Benin (ISO 3166 Digram) -Blowjob (oral Sex) |
| BJP | Bharatiya Janata Party (Indian People's Party) |
| BJT | Bipolar Junction Transistor |
| BK | Bankrupt (most Often Seen As Gone BK) -Bosnia And Herzegovina (FIPS 10-4 Country Code) |
| BK | Berkelium |
| BKN | Broken Sky (METAR Code) |
| BL | Bolivia (FIPS 10-4 Country Code) -British Leyland |
| BLCSE | Battle Laboratory Constructive Simulation Environment |
| BLDU | Blowing Dust (METAR Code) |
| BLEVE | Boiling Liquid Expanding Vapour Explosion (blevy) |
| BLOB | Binary Large OBject |
| BLR | Belarus (ISO 3166 Trigram) |
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