Base Transceiver Station 
Bureau of Transportation Statistics 
Border and Transportation Security 
Bit Test and Set 
BATCH TERMINAL SIMULATOR 
Brazilian thorium sludge 
British Toxicology Society 
Back To School 
Backbone Transmission Service 
Base Tranceiver Station 
Base Transceiver System 
Base Transceiver Systems 
Board Tracking System 
Booster Technology Simulator 
British Thoracic Society 
Broadcast Technology Society 
Bug Tracking System 
By the Same 
Aerotaxis Albatros 
Bachelor of Theological Studies 
BAC-T-SCREEN 
Bagless transfer system 
Bangor Township Schools 
Barium Titanate Stannate 
Barium Titanium Silicate 
Base Station Tranceiver Subsystem 
Base Telecommunications Systems 
Base Tranceiver System 
Base Transceiver Site 
Base Transceiver Station entities