| Acronym | Meaning |
 | APLJHU | Applied Physics Laboratory John Hopkins University |
| GNU | GNU's Not UNIX (a Recursive Acronym) |
| CAS | Commission For Atmospheric Science |
| TDL | Techniques Development Lab |
| TIMED | Thermosphere-Ionosphere-Mesosphere Energetics & Dynamics |
| NAS | National Academy Of Sciences |
| ARC | Accelerating Rate Calorimetry |
| MVS/XA | Multiple Virtual Systems/Extended Architecture |
| ATMS | Advanced Traffic Management System |
| IPEI | Ionospheric Plasma And Electrodynamics Instrument |
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