| Acronym | Meaning |
| OBK3 | Third-order Oppenheimer-Brinkman-Kramers |
| SAR | Synthetic Aperture Radar |
| ELO | Equivalent Localized Orbitals |
| ST4CCD | Coupled Cluster (with) Double (substitutions And) Single (and) Triple (substitutions Incorporated Via) Fourth-order (perturbat |
| TGVBA | Target Generalized Valence Bond Approximation |
| IESS | Inelastic Electron Scattering Spectroscopy |
| HCN | US Historical Climatology Network |
| 2DEG | Two-dimensional Electron Gas |
| HPSEC | High Performance Size Exclusion Chromatography |
| MFAG | Medical First Aid Guide For Use In Accidents Involving Dangerous Goods |