| Abbreviation | Definition |
|---|---|
| SFN | Single Frequency Network |
| SFQ | Single Flux Quantum |
| SFR | Special Function Registers |
| SFRA | Sweep Frequency Response Analysis |
| SFT | Slow Fourier Transform |
| SG | Screen Grid |
| SG | Spark Gap |
| SG | Synchronous Generator |
| SGE | Siemens and General Electric |
| SGEG | Shanghai Guangdian Electric Group |
| SGG | System Generated Graph |
| SGML | Standard Generalized Markup Language |
| SGMM | Semiconductor Generic Manufacturing Model |
| SGRAM | Synchronous Graphics Random Access Memory |
| SHE | Standard Hydrogen Electrode |
| SHEF | Satelite Hypersensitive Electronic Foodration |
| SHEQ | Occupational Safety, Health, Environmental, and Quality |
| SHF | Super HyperFine (interaction) |
| SHG | Second Harmonic Generation |
| SHO | Super High Output |