| Acronym | Meaning |
| APSA | Advanced Photovoltaic Solar Array |
| ESAD | Electron-stimulated Associative Desorption |
| INN | International Nonproprietary Names (for Drugs) |
| HI | Hydrogen Index |
| TPAD | Temperature Programmed Ammonia Desorption |
| RE | Recoupled States (in Orbiting Resonances Calcns. In Atom-mol. Inelastic Scattering) |
| SCLR | Single Configuration Linear Response (theory) |
| RLMTO | Relativistic Linear Muffin-tin Orbital |
| ACPR | Annular Core Pulse Reactor |
| CAMEO | Computer Assisted Mechanistic Evaluation Of Organic Reactions |