| Acronym | Meaning |
 | RFL | Restrictive Fire Line (military) |
| JFMCC | Joint Force Maritime Component Commander |
| AAFC | U.S. Army Air Corps Ferrying Command (1941-1942) - All-America Football Conference (1946?1949) |
| PLL | Phase-Locked Loop (electronics) |
| UNSM | Union Of Nova Scotian Municipalities |
| ATGW | Anti-Tank Guided Weapon |
| ST | Saint Lucia (FIPS 10-4 Country Code) - S?o Tom? And Prncipe (ISO 3166 Digram) |
| FXX | Metropolitan France (ISO 3166 Trigram; Obsolete 1997) |
| USNP | United States Newspaper Program |
| ICNAF | International Commission For The Northwest Atlantic Fisheries (became NAFO In 1978) |
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