| Acronym | Meaning |
| PIO | Paired Interaction Orbital |
| FVVM | Finite Volume Variational Method (for Mol. Calcns.) |
| ABC | Absorbing Boundary Condition (green Function) |
| LCFFUA | Linear Combination Of Floating Functions Of United Atom |
| GLRS | Grating Light Reflection Spectroscopy |
| SITE | Superfund Innovative Technology Evaluation |
| OEMO | One Electron Molecular Orbital |
| PSRI | Planetary Sciences Research Institute |
| DSW | Dirac Scattered-wave (often As SCF-X(alpha)-DSW Method) |
| IGT | Impaired Glucose Tolerance |