| Acronym | Meaning |
| TDA-2PH | Two-particle One Hole Tamm-Dancoff Approximation |
| EHN | Environmental Health Network |
| ICU | Intensive Care Unit |
| COCI | Committee On Chemistry And Industry (IUPAC) |
| VGP | Virtual Geomagnetic Pole |
| CLSM | Controlled Low Strength Material |
| CVBM | Conduction-valence-band Model (in Electronic Structure Calcns.) |
| IMMA | Ion Microprobe Mass Analysis |
| LIR | Limiting Infiltration Rate |
| SCALPEL | Scattering With Angular Limitation Projection Electron Lithography |