| F1, | F2 etc. first, second, etc., filial generation |
|---|---|
| FEV1, | FEV1 forced expiratory volume in one second |
| FIV1 | forced inspiratory volume in one second |
| g/s | gallons per second |
| IPS | idiopathic pain syndrome; idiopathic postprandial syndrome; inches per second; infundibular pulmonar... |