| Acronym | Meaning |
| RPAE | Random Phase Approximation With Exchange |
| EASOE | European Arctic Stratospheric Ozone Expt. |
| REACCS | Reaction Access System |
| ESS | European Spallation Source |
| SAED | Selected Area Electron Diffraction |
| AIP | Acute Intermittent Porphyria |
| HOMER | Hazardous Organic Mass Emission Rate |
| GLOSS | Global Sea Level Observing System (of IOC) |
| CVG | Cochleovestibular Ganglion |
| FSR | Free Spectral Range |