| Acronym | Meaning |
| NATICH | National Air Toxics Information Clearinghouse |
| HSA | Hyperspherical Adiabatic (for Resonances In Electron-atom Scattering. Energy Levels |
| TCA | Trichloroacetic Acid |
| MON | Motor (method) Octane No. |
| NOX | Nitrogen Oxides |
| MC-DWBA | Multichannel Distorted Wave Born Approxn. |
| EMP | Electron Micro-probe |
| AEY | Auger Electron Yield |
| LOGMO | Lowest Occupied Gaussian Molecular Orbital |
| NNLO | Next-to-next-to-leading Order |