| Abbreviation | Definition |
|---|---|
| SQT | Squat |
| SQU | SQUare |
| SQV | Vertical Square |
| ST | Stone |
| st. | stone |
| STON | Short Ton |
| STU | Space Time Unit |
| SU | Sensitivity Unit |
| SU | Standard Units |
| SU | Supplemented Unit |
| SUD | Subjective Units of Distress |
| SVH | SieVert (radiation dose unit of measure) per Hour |
| SWG | Standard Wire Gauge |
| SY | Square Yard |
| SYC | Static Yard Capacity |
| SYU | Sustained Yield Unit |
| T | short ton |
| T | Time |
| T | Ton |
| T. | ton |