| Acronym | Meaning |
 | AP | Anomalous Propagation |
| CDDIS | Crustal Dynamics Data Information System |
| API | Axial Power Indicator |
| GVAR | GOES Variable |
| RITS | Radiatively Important Trace Substances |
| FODDAS | Four-Dimensional Data Assimilation Study |
| ATM | Asynchronous Transfer Mode |
| SPC | Small Particle Count (or Counter) |
| FCA | Functional Configuration Audit |
| IRR | Integrated Requirements Review |
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