| Acronym | Meaning |
 | GA | Billion Years Unit |
| IRC | International Radiation Commission |
| HPO | High Performance Option |
| GCTM | Global Chemical Transport Model |
| AON | Atmospheric Odd Nitrogen Species Project |
| H/W | Hardware |
| JERS | Japan Earth Remote Sensing Satellite |
| NEXUS | Next Upper Air Sounder (system) |
| IDR | Incremental Design Review |
| PHS | Public Health Service |
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