| Abbreviation | Definition |
|---|---|
| SCU | Strong-Cobb Unit |
| SD | Schwinger-Dyson (equation) |
| SD | Super Deformed |
| SDF | Spectral Density Function |
| SDFF | Spectroscopically Determined Force Field |
| SDIU | Scanivalve Digital Interface Unit |
| SDLA | Serial Data Link Analysis |
| SE | Stimulated Emission |
| SEAM | Spatially Extended Anchor Mechanism |
| SEBM | Selective Electron Beam Melting |
| SEE | Secondary Electron Emission |
| SEF | Spectral Energy Flux |
| SEF | Symmetric Electromagnetic Field |
| SEFA | Strong Electrostatic Forces of Attraction |
| SEI | Specific Energy Input |
| SEM | scanning emectron microscopy |
| SEM | Secondary Electron Multiplier |
| SEM | Standard Error of Measurement |
| SEM | Structural Equation Modeling |
| SEM | Structural Equation Models |