| Acronym | Meaning |
| APEX | Active Plasma Experiment Satellite |
| ASE | Augmented Secular Equation |
| AS | Auger Spectroscopy |
| GIAO | Gage-independent Atomic Orbital |
| TUES | Tubingen Ultraviolet Echelle Spectrometer |
| PAK | P21-Activated Kinase |
| PCI | Perturbative Configuration Interaction |
| PDEA | Preliminary Draft Environmental Assessment |
| GBS | Grain Boundary Sliding |
| OPIT | Oxide Powder In Tube |