| PSI | posterior sagittal index; problem solving information; prostaglandin synthetic inhibitor; psychological services index; psychosomatic inventory |
|---|---|
| psi | pounds per square inch |
| psia | pounds per square inch absolute |
| PSICU | pediatric surgical intensive care unit |
| pSIDS | partially unexplained sudden infant death syndrome |
| PSIFT | platelet suspension immunofluorescence test |
| PSIL | preferred frequency speech interference level |
| PSIS | Posterior Superior Iliac Spine; 상후장골극, 위뒤장골가시 |
| PSIS | posterior sacroiliac spine |
| y | Greek letter psi; wave function |
|---|