| Acronym | Meaning |
| NPDWR | National Primary Drinking Water Regulations |
| OD | Optical Density |
| PUHF | (spin)-projected Unrestricted Hartree-Fock |
| MIP | Mercury Intrusion Porosimetry |
| CLRC | Central Laboratory Of The Research Councils |
| GTN | Global Trend Network |
| GHF | Generalized Hartree-Fock Method |
| ODES | Ocean Data Evaluation System |
| ICRF | Imperial Cancer Research Fund |
| FCCU | Fluidized Catalytic Cracking Unit |