| Acronym | Meaning |
| LRU | Line Replaceable Unit |
| JSC | Johnson Space Center |
| UAO | Upper Atmosphere Observatory |
| APS | Autocorrelated Photon Spectroscopy |
| GEM | Global Environmental Multiscale Model |
| PMIP | Paleoclimate Modeling Intercomparison Project |
| SST | Sea Surface Temperature |
| MACCM2 | Middle Atmosphere Community Climate Model |
| SI | Systeme International |
| AICE | American Institute Of Chemical Engineers |