| Abbreviation | Definition |
|---|---|
| BRAVO | Business Risk And Value of Operation in Space |
| BRB | Ballistic Recoverable Booster |
| BRCS | Basic Reference Coordinate System |
| BRD | Broadcast |
| BRG | Bearing |
| BRK | Brake |
| BRKT | Bracket |
| BRM | Biological Research Module |
| BRML | Block Recorder Mission Log |
| BRPM | Breath Rate Per Minute |
| BRRS | Banana River Repeater Station |
| BRS | Big Red Switch |
| BRS | Bottom Right Side |
| BRT | Bright |
| BRU | Battery Regulation Unit |
| BS | Block Specification |
| BSA | Bottom Side Alignment |
| BSC | Brake Skid Controller |
| BSDP | Booster Stage Discharge Pressure |
| BSE | Booster Systems Engineer |