| Acronym | Meaning |
 | VFR | Visual Flight Rules |
| HZ | Hertz |
| PS | Pashto Language (ISO 639-1 Code) - Picosecond |
| TV | Television -Teravolt -Transvestite -Tuvalu (ISO 3166 And FIPS 10-4 Country Code Digram) |
| PSI | Portable Source Initiative |
| KUL | Katholieke Universiteit Leuven (Flemish |
| EMU | Electric Multiple Unit - A Method Of Connecting Self-propelled Railway Vehicles Together To Form A Train Under The Control Of One Driver. |
| UPF | Universitat Pompeu Fabra (Catalan |
| CAA | Canadian Automobile Association - (NORAD) Center For Aerospace Analysis - (U.S.) Center For Army Analysis - (U.S.) Clean Air Act - (U.S. Army) Concepts Analysis Agency - Civil Aviation Authority - Colonial Athletic Association |
| ORF | Operational Readiness Float |
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