| Acronym | Meaning |
| TLA | Thin Layer Activation |
| NESHAPS | National Emission Standards For Hazardous Air Pollutants |
| NCEH | National Center For Environmental Health |
| AWS | American Welding Society |
| EFTIR | Emission Fourier Transform Infrared Spectroscopy |
| RAS | Routine Analytical Services |
| MCI | Mild Cognitive Impairment |
| UNO | Unrestricted Natural Orbital |
| MOSHO | Maximum Overlap Symmetry Hybrid Orbital |
| SEE | Static Exact Exchange (approxn. In Electron-mol. Scattering) |