| Acronym | Meaning |
| RPAE | Random Phase Approximation With Exchange |
| LIF | Laser Induced Fluorescence |
| PPMSVX | Pseudopotential Multiple-scattering Valence-exchange |
| 2DEG | Two-dimensional Electron Gas |
| AIRDAS | Airborne Infrared Disaster Assessment System |
| PNN | Lead Nickel Niobate |
| THESEO | Third European Stratospheric Experiment On Ozone |
| O/E | Observed Number/expected Number Ratio = Relative Risk |
| PPLN | Periodically Poled Lithium Niobate |
| ANITA | Ammonia And Nitrification Analyzer |