| Acronym | Meaning |
| POA | Peierls-Onsager Approxn. (in Electronic Structure Calcns.) |
| LR-SCF | Low-rank SCF |
| NSWMA | National Solid Wastes Management Association |
| EMIS | Environmental Management Information System |
| HMIS | Hazardous Material Identification System |
| PES | Potential Energy Surface |
| PMDL | Practical Method Detection Limit |
| CLIMAP | Climate Long-range Investigation Mapping And Prediction |
| TER | Total External Reflection |
| IPIRDW | Independent-process (and) Isolated-resonance (approxn. Using) Distorted Waves |