| PIIS | posterior inferior iliac spine |
|---|---|
| PNS | paraneoplastic syndrome; parasympathetic nervous system; partial nonprogressive stroke; peripheral n... |
| PSIS | posterior sacroiliac spine |
| Sp | the most posterior point on the posterior contour of the sella turcica; species; specific; specimen;... |
| sp | space; species; specific; spine, spinal; spirit |