| Acronym | Meaning |
| HSI | Hyperthermal Surface Ionization |
| LEPS | London-Eyring-Polanyi-Sato (potential-energy Surface) |
| LGM | Last Glacial Maximum (most Recent Era Of Continental Glaciation; See Also PGP) |
| APF | Advanced Particle Filter |
| HVT | Hypervirial Theory |
| PIES | Penning Ionization Electron Spectroscopy |
| SAPW | Symmetrized Augmented Plane Wave |
| UARP | Upper Atmospheric Research Program |
| VARTM | Vacuum Assisted Resin Transfer Molding |
| THCP | Total Hazard Control Plan |