| Abbreviation | Definition |
|---|---|
| SFBI | Shear Flow Ballooning Instability |
| SFC | Sideway Force Coefficient |
| SFD | Shear Force Diagram |
| SFE | Supercritical Fluit Extraction |
| SFF | Scientific Fudge Factor |
| SFP | Synthetic Ferromagnetic Pinned |
| SG | Specific Gravity |
| SGA | Spectrographic Analysis |
| SGE | Stimulus Generation Event |
| SGF | System Gravitation Explosion |
| SGF | System Gravitation Explosion |
| SGL | Sander Geophysics Ltd |
| SGR | Soft Gamma Repeater |
| SHC | Specific Heat Capacity |
| SHEL | Surface High-Energy Laser |
| SHEP | Southampton High Energy Physics |
| SHHG | Solid High Harmonic Generation |
| SHM | Simple Harmonic Motion |
| SHOPO | Small High-power Optics Program |
| SHP | shaft horsepower |