| Acronym | Meaning |
| PIUS | Process Inherent Ultimate Safety |
| HTSC | High Temperature Superconductor |
| IEM | Independent Electron Model (for Ionization In Ion-atom Collisions) |
| AQDM | Air Quality Display Model |
| IETS | Inelastic Electron Tunneling Spectroscopy |
| AQMP | Air Quality Management Plan |
| IIRF | Infinite Impulse Response Filter |
| HBV | Hartree-Bogolyubov-Valatin (theory In Calcn. Of Wave Functions) |
| CAM | Computer-aided Manufacturing |
| ISLSCP | International Satellite Land Surface Climatology Project |