| SIg, sIg | surface immunoglobulin |
|---|---|
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SIP | Sickness Impact Profile; slow inhibitory potential; surface inductive plethysmography |
| SmIg | surface membrane immunoglobulin |
| S-MUAP | surface-detected motor unit action potential |