British Standards Institution 
British Standards Institute 
Bachelor of Science in Intelligence 
Boeing Services International, Inc. 
Basic Shipping Instructions 
bloodstream infections 
Body substance isolation 
Base Support Installation 
Basic Services Interface 
bloodstream infection 
Boeing Services Incorporated 
Brain Science Institute 
British Society for Immunology 
British Society of Immunology 
British Standard Institute 
Backplane Signaling Interface 
Backplane Signaling Interrupt 
Bandeiraea Simplicifolia Isolectin 
Base slot indicator 
Baseband Serial Interface 
Battlefield Systems Institute 
Battlefield Systems Integration 
Behavioural Status Index 
Bentley Systems, Incorporated 
Binary Synchronous Interface 
Biochemical Society of Israel 
biogenic silica 
BioSystems International 
BiSynchronous Interface 
Bit Sequence Independence