| Acronym | Meaning |
| ECPSSR | Energy-loss Coulomb-repulsion Perturbed-stationary-state Relativistic Theory |
| STEM | Scaled Taylor Exponential Model |
| CHEMRAWN | Chemical Research Applied To World Needs |
| TBNEM | Tight-binding Nearly Free Electron Model |
| PHF | Periodic Hartree-Fock |
| DSA | Dynamic Simulated Annealing (for Electronic Structure In Liq.metals) |
| IEL | Independent Electron (model In Ion-impact Ionization Calcns.) |
| EORCU | European Ozone Research Coordinating Unit |
| SRAPW | Scalar Relativistic Augmented Plane Wave |
| MMSE | Minimum Mean Square Error |