| Abbreviation | Definition |
|---|---|
| SIM | Source Independent Measurement |
| SIM | Strobed Inspection Module |
| SIMD | Single Instruction Multiple Data |
| SIMO | Single Input, Multiple Output |
| SIMOX | Separation by IMplantation of OXygen |
| SIMS | Secondary Ion Mass Spectroscopy |
| SINR | Signal to Interference plus Noise Ratio |
| SIOA | Surface Induced Optical Anisotropy |
| SIP | Single In-line Package |
| SIPP | Single In-line Pin Package |
| SIR | Surface Insulation Resistance |
| SIRIJ | Semiconductor Industry Research Institute of Japan |
| SIS | Safety Instrumented System |
| SIS | Superconductor Insulator Superconductor |
| SISFET | Semiconductor-Insulator-Semiconductor Field Effect Transistor |
| SISO | Single Input, Single Output |
| SISR | Speaker Independent Speech Recognition |
| SIT | Static Induction Transistor |
| SIU | Shelf Interface Unit |
| SIV | Sensors In Vacuum |