| Acronym | Meaning |
| PRE | Pitting Resistance Equivalent |
| EESI | Environment And Energy Study Institute |
| GCLDA | Gradient-corrected Local Density Approximation |
| CPHF | Coupled Perturbed Hartree-Fock |
| ECCS | Emergency Core Cooling System |
| BS | Breathing Sphere (approxn. In Mol.-scattering Calcns.) |
| EBIS | Electron-beam Ion Source |
| FILOS | Far Infrared Limb Observing Spectrometer |
| ESCORT | Error Self-compensation Reached By Tau-scrambling |
| UDF | Unrestricted Dirac-Fock |