| Abbreviation | Definition |
|---|---|
| SCFPM | Standard Cubic Feet Per Minute |
| SCH | Semester Credit Hours |
| SCM | Square Centimeter |
| SCM | Standard Cubic Meter |
| SDR | Standard Dimension Ratio |
| SEC | Second |
| sec(s) | second(s) |
| SF | Square Feet |
| SF | Square Foot |
| SFCA | Square Foot Contact Area |
| SFM | Surface Feet per Minute |
| SFPM | Surface Feet Per Minute |
| SH | Semester Hours |
| SHA | Sidereal Hour Angle |
| SHU | Scoville Heat Units |
| SI | Système International d'unités (International System of Units) |
| SIB | Scale Index Base |
| SL | Step Length |
| SMM | Standard Method of Measurement |
| SMPG | Seat Miles Per Gallon |