| Acronym | Meaning |
 | PDD | Past Due Date - Presidential Decision Directive |
| PS | Picosiemens |
| ACDC | Alternating Current Direct Current |
| NFA | No-Fire Area |
| QD | Quaque Die (Latin |
| NQOCD | Not Quite Our Class |
| DRAGN | Double Radio Source Active Galactic Nucleus (dragon) |
| NAC | National Agency Check - U.S. Naval Avionics Center - U.S. Navy Advanced Concepts - North Atlantic Council - Northern Area Command |
| CTMS | Clinical Trial Management System |
| MM | Millimetre |
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