| Acronym | Meaning |
| APTI | Air Pollution Training Institute |
| ICRMS | Ion Cyclotron Resonance Mass Spectrometry |
| BKCM | Burkhardt-Konya-Coulson-March (for Electron Momentum Densities) |
| APT | Atomic Polar Tensor (in Ir Spectra Calcn.) |
| DIANE | Direct Information Access Network For Europe |
| EEF GTO | Electric Field Gradient Gaussian-type Orbital |
| KHN | Knoop Hardness |
| SVP | Schwinger Variational Principle |
| ESG | Electronic Specialty Gases |
| GWTR | Ground Water Treatment Rule |