| S | Greek capital letter sigma; syphilis; summation of series |
|---|---|
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| BVR | baboon virus replication |
| RCR | relative consumption rate; replication-competent retrovirus; respiratory control ratio |