| Acronym | Meaning |
 | STEM | Scanning-transmission Electron Microscope |
| PCO | Polar Cap Observatory |
| IRC | International Radiation Commission |
| FS | Flight Segment |
| HPO | High Performance Option |
| HIRRLS | High Resolution Research Limb Sounder |
| HANK | N/A |
| DARTS | DOE Audit Reporting & Tracking System |
| ABLE | Activity Balance Line Evaluation |
| IWG | Implementation Working Group |
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