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BunnyTracks - a game type for the video game Unreal Tournament.

Civilization IV: Beyond the Sword

Bangkok (Mass) Transport System

Built to Spill - a popular American indie rock band

Beyond the Supernatural - a roleplaying game

Broadcast Television Systems Inc. - video company

Baptist Theological Seminary in Kakinada, India

Behind the Scenes - An internet phrase

British Thoracic Society

Base Transceiver Station - GSM base station

Berjaya Times Square - a 12-story shopping mall located in Kuala Lumpur, Malaysia

BizTalk Server - a Microsoft product for business process and integration

Bug Tracking System

Bureau of Transportation Statistics - part of the United States Department of Transportation (DOT)

Business Training Systems - a public company within the Consultant/Educational field. Develops Business Simulations and e-learning solutions

M. R. Štefánik Airport - the main airport of Slovakia located in Bratislava.