| Acronym | Meaning |
| CCA | Crystalline Cluster Approach (in Electronic Structure Calcns.) |
| TTS | T Tauri Star |
| WMMA | Waste Materials Management Act |
| ASE | Activated Sludge Effluent |
| APUHF | Approximately Projected Unrestricted Hartree-Fock |
| PAK | P21-Activated Kinase |
| SI | Stieltje Imaging (method For Calcg. Wave Functions) |
| OMEGA | Method In Molecular Orbital Calculations |
| QDM | Quadrature Discretization Method (in Electron Transport Properties Calcns.) |
| CPE | Cloud Point Extraction |