| Acronym | Meaning |
| LCAO CO | Linear Combination Of Atomic Orbitals Crystal Orbital |
| NATICH | National Air Toxics Information Clearinghouse |
| MIM | Multipole-induced-multipole Model |
| MCB | Micro-carrier Bed |
| CODEX | Centerband-only Detection Of Exchange |
| ASTRAP | Advanced Statistical Trajectory Regional Air Pollution Model |
| BO | Biorthonormal (wave Function) |
| WSHS | Watershed Hydrologic System |
| AWRG | Acid Waters Review Group (UK) |
| ESSESA | Expert System For Structure Elucidation From Spectral Analysis |