| Acronym | Meaning |
| ICP-OES | Inductively Coupled Plasma-optical Emission Spectroscopy |
| SMAW | Shielded Metal Arc Welding |
| CPAP | Continuous Positive Airway Pressure |
| MRE | Mining Research Establishment |
| FEN | Free Electron Network |
| NIESST | Nuclear Decay-induced Excited-spin-state Trapping |
| TSD | Treatment, Storage, Or Disposal |
| NWR | National Wildlife Refuge |
| TBBM | Tight-binding Bond Model |
| PP | Pariser Parr |