| Acronym | Meaning |
| GIXA | Glancing-incidence X-ray Analysis |
| PHD | P-helicity Decoupling Scheme (p=momentum) |
| MET | Multichannel Eikonal Theory (in Atom Electron-impact Excitation) |
| CPSS | Chemist's Personal Software Series |
| PPAR | Peroxisome Proliferator-activated Receptor |
| ECAP | Equal Channel Angular Pressing |
| RSMP | Rayleigh-Schroedinger-Moeller-Plesset Perturbation |
| ISTEA | Intermodal Surface Transportation Efficiency Act |
| DSCCR | Diffractive Sudden-closed Coupled Rotation (for Mol.-surface Scattering Calcns.) |
| DNS | Direct Numerical Simulation |