| Acronym | Meaning |
| SCGF | Self-consistent Group Function |
| PWG SCF | Plane-wave Gaussian Self-consistent Field Method |
| PIRG | Public Interest Research Group |
| MLVSS | Mixed Liquor Volatile Suspended Solids |
| SIMD | Single-instruction Multiple-data |
| GOCO | Government-owned |
| GNO | Geminal Natural Orbital |
| MCEP | Multiconfigurational Electron Propagator (in Ionization Potential Calcns.) |
| ADEOS | Advanced Earth Observing Satellite |
| BEM | Boundary Element Method |