| Acronym | Meaning |
| HKS | Hohenberg-Kohn-Sham (quantum Theory) |
| OA | Office Of The Administrator |
| CGO | Configuration Generating Orbital (a Type Of MO) |
| GAW | Global Atmospheric Watch |
| UBM | Under Bump Metallurgy |
| XPEEM | X-ray Photoemission Electron Microscopy |
| CHAP | Chronic Hazard Advisory Panel |
| PHF | Paired Helical Filament |
| ADA | American Diabetes Association |
| ESA | Electron Stimulated Adsorption |