| Abbreviation | Definition |
|---|---|
| BIO | Bio-Research Module |
| BIO | BIOseparation |
| BIOMED | BIOlogical MEDicine |
| BIOS | BIOlogical Satellite |
| BIPROP | BIPROPellant |
| BIS | Biocide Injection System |
| BITNET | Because It is Time NETwork |
| BIU | Buffer Interface Unit |
| BK | Back |
| BK | Brake |
| BKHD | BulKHeaD |
| BLOW | Booster Lift-Off Weight |
| BLR | BoiLeR |
| BLS | Bottom Left Side |
| BLV | BLeed Valve |
| BLWR | BLoWeR |
| BM | Basal Metabolism |
| BM | Body Mounted |
| BM | Business Manager |
| BMA | Body-Mounted Accelerometer |