| Sh | sheep; Sherwood number; Shigella; shoulder |
|---|---|
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| TD | the time required to double the number of cells in a given population; thermal death time |
| UPIN | universal physician identifier number [HCFA] |
| VHN | Vickers hardness number |