| fps | feet per second; frames per second |
|---|---|
| rad/s | rad per second; radian per second |
| BDC | Bazex-Dupre-Christol [syndrome]; burn-dressing change |
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| BU | base of prism up; Bethesda unit; blood urea; Bodansky unit; bromouracil; burn unit |