| Abbreviation | Definition |
|---|---|
| SMU | Semiconductor Matrix Unit |
| SMU | Source/Meter Unit |
| SMV | Selectable Mode Vocoder |
| SNA | Systems Network Architecture |
| SNAP | Selective Niobium Anodization Process |
| SNEV | Super Nova Electric Vehicle |
| SNI | Selective Noise Isolator |
| SNI | Simultaneous Non-Interfering |
| SNI1 | Selective Noise Isolator Type 1 |
| SNI2 | Selective Noise Isolator type 2 |
| SNIR | Sighal to Noise plus Interference Ratio |
| SNIS | Superconductor-Normal metal-Insulator-Semiconductor |
| SNMS | Sputtered Neutral Mass Spectroscopy |
| SNOM | Scanning Nearfield Optical Microscopy |
| SNR | Signal-to-Noise Ratio |
| SNTTE | Sign-on Table Terminal Entry |
| SO | Small Outline (package) |
| SOA | Semiconductor Optical Amplifier |
| SOBF | SURE Optimal Bilateral Filter |
| SOC | State of Charge |