| Acronym | Meaning |
| PSES | Pretreatment Standards For Existing Sources |
| VOHAP | Volatile Organic Hazardous Air Pollutant |
| ELLPAT | Environmental Lead Laboratory Proficiency Analytical Testing |
| RLS | Resonance Light Scattering |
| RMC | Relativistic Multiconfiguration |
| CMX(2) | Second-order Connected Moments Expansion (method For Calcg. Correlation Energies Of Mols.) |
| QCPE | Quantum Chemistry Program Exchange |
| RSE | Relativistic Symmetric Eikonal |
| TCF | Totally Chlorine-free [in Pulp Industry] |
| MAST | Marine Science And Technology Programme |