sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Off Balance Sheet Activities | ** |
| Ontario Billiard and Snooker Association | ** |
| Organizational Behavior Student Association | ** |
| Omnidirectionally Balanced Symmetric Antisymmetric | * |
| Owen Black Students Association | * |
| Okanagan Business Students Association | * |
| Osceola Baseball Softball Association | * |