| Acronym | Meaning |
| LSDFT | Local Spin Density Functional Theory |
| EMS | Environmental Management System |
| AEI | Avalanche Electron Injection |
| AAR | Accumulation-area Ratio (for Glaciers) |
| MP2(FC) | MP2(frozen Core) Only (outer) Valence Electrons Included In The Approximation |
| HEAL | Human Exposure Assessment Location |
| HCCI | Homogeneous Charge Compression Ignition |
| HRMS | High Resolution Microwave Survey |
| DRF | Dose Reduction Factor |
| SSD | Solid State Detector |