| Acronym | Meaning |
| ERL | Environmental Research Laboratory |
| LCAO LDA | LCAO-local Density Approxn. |
| MR-SAC | Multireference Symmetry-adapted-cluster (quantum Theory Or Wave Function For Mol. Calcns.) |
| SMP | Submitochondrial Particle |
| SAR | Sequential Adiabatic Reduction |
| LGM | Last Glacial Maximum (most Recent Era Of Continental Glaciation; See Also PGP) |
| IEEE | Institute Of Electrical And Electronics Engineers |
| NOE | Nuclear Overhauser Enhancement |
| HATREMS | Hazardous And Trace Emissions System |
| CEF | Crystal Electric Field |