| D2 | diagonal two; second dorsal vertebra |
|---|---|
| F1, | F2 etc. first, second, etc., filial generation |
| FEV1, | FEV1 forced expiratory volume in one second |
| FIV1 | forced inspiratory volume in one second |
| L1, | L2, L3, L4, L5 first, second, third, fourth, and fifth lumbar vertebrae |