(ISO 3166 trigram) BI bi – (s) Bislami language (ISO 639-1 code) Bi – (s) Bismuth BI – (s) Burundi (ISO 3166 digram) BIAP – (a) Baghdad International Airport – (p) Biafran pound BICS – (i/a) Battlefield Information and Communication System BID – (i) bis in die (Latin, "twice a day") BIDST – (i) British Institute of Dental and Surgical Technologists BIF – (s) Burundian franc (ISO 4217 currency code) bih – (s) Bihari languages (ISO 639-2 code) BIH – (s) Bosnia and Herzegovina (ISO 3166 trigram) BIOS – (a) Basic Input/Output System – British Institute of Organ Studies BIP – (a) Battlefield Interoperability Programme (ancestor of MIP) – Broadcast incremental power algorithm bis – (s) Bislami language (ISO 639-2 code) BISEPS – (a) Battlefield Identification System Environment Performance Simulation BIST – (a) Built-In Self-Test BIT – (a) Bilateral Investment Treaty – Built-In Test BITE – (a) Built-In Test Equipment BJ BJ – (s) Benin (ISO 3166 digram) – (i) Blowjob (oral sex) BJJ – (i) Brazilian Jiu-Jitsu BJP – (i) Bharatiya Janata Party (Indian People's Party) BJT – (i) Bipolar Junction Transistor BK Bk – (s) Berkelium BK (i) Burger King (p) Bankrupt (most often seen as "gone BK") (s) Bosnia and Herzegovina (FIPS 10-4 country code) BKN – (s) Broken Sky (METAR Code) BL BL (s) Bolivia (FIPS 10-4 country code) (i) British Leyland BLCSE – (i) Battle Laboratory Constructive Simulation Environment BLDU – (s) Blowing Dust (METAR Code) BLEVE – (a) Boiling Liquid Expanding Vapour Explosion ("blevy") BLK – (i) Basket Liga Kobiet (Polish, "Women's Basketball League") BLOB – (p) Binary Large OBject BLR – (s) Belarus (ISO 3166 trigram) BLSA – (s) Blowing Sand (METAR Code) BLRSI – Battle Lab Reconfigurable Simulator (U.S. Army) BLSN – (s) Blowing Snow (METAR Code) BLT – (i) Bacon Lettuce Tomato (sandwich) BLUFOR – (p) Blue Force(s) (military) BLUI – (a/i) Body Language User Interface ("blooie") BLZ – (s) Belize (ISO 3166 trigram) BM bm – (s) Bambara language (ISO 639-1 code) BM – (i) Battle Management – (s) Bermuda (ISO 3166 digram) – Myanmar (FIPS 10-4 country code; from Burma) BMA – (i) British Medical Association BMCC – (i) Borough of Manhattan Community College BMD – (i) Ballistic Missile Defence – (s) Bermudian dollar (ISO 4217 currency code) – (i) Boyevaya Mashina Desanta (Russian Боевая Машина Десанта, "Combat Vehicle Airborne") † – British Military Doctrine BMDG – (i) British