| Acronym | Meaning |
 | ESSIS | Earth System Science Information System |
| MARC | Machine Readable Cataloging |
| AEA | Atomic Energy Authority |
| DNFSB | Defense Nuclear Facilities Safety Board |
| ENSTROPHY | N/A |
| RUCS | Rapid Update Cycle Surface |
| FERC | Federal Energy Regulatory Commission |
| SPAN | Space Physics Analysis Network |
| HEOS | Highly Eccentric Orbit Satellite |
| GNU | GNU's Not UNIX (a Recursive Acronym) |
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