| Abbreviation | Definition |
|---|---|
| BHSAI | British Horse Society Assistant Instructor |
| BHSI | British Horse Society Instructor |
| BI | Best Individual |
| BiLAT | Bilateral Negotiation Trainer |
| BIO | Biology Investigative Opportunities |
| BISEE | Beijing Institute of Spacecraft Environment Engineering |
| BKPR | BeeKeePeR |
| BLDR | Builder |
| BLM | Branch Lending Manager |
| BLT | Building Leadership Team |
| BM | Bank Messenger |
| BM | Barbarian Mercenary |
| BM | Beast Master |
| BM | Blog Master |
| BMA | Behavior Management Assistant |
| BMD | Big Mean Dude |
| BMG | Black Magician Girl |
| BMW | Boat Maintenance Worker |
| BNC | Boardman Number Custodian |
| BOA | Branch Office Administrator |