| Acronym | Meaning |
 | ZS | Zeptosecond |
| CRE | Cree Language (ISO 639-2 Code) |
| PDF | Panama[nian] Defense Forces (abolished 1990) - Portable Document Format - Principal Direction Of Fire |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
| SC | Scandium |
| UNFICYP | United Nations Peacekeeping Force In Cyprus |
| NAVCAMS | Naval Communications Area Master Station |
| HE | High Explosive |
| AAAS | American Association For The Advancement Of Science |
| DODAF | U.S. Department Of Defense Architectural Framework |
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