| Acronym | Meaning |
 | SKC | Clear Sky (METAR Code) |
| RPR | FOM - Realtime Platform Reference Federation Object Model (reaper Fomm) |
| ACE | Air Combat Emulator (computer Game) - Allied Command Europe - Armored Combat Earthmover - Automatic Computing Engine |
| PM | Panama (FIPS 10-4 Country Code) -Perry Mason - Phase Modulation - Post Meridiem (Latin After Noon) - Prime Minister - Project Manager -Saint Pierre And Miquelon (ISO 3166 Digram) |
| CE | Cerium |
| ARP | Address Resolution Protocol - Applied Research Programme |
| A2C2 OR A?C? | Army Airspace Command And Control |
| EPO | Esperanto Language (ISO 639-2 Code) |
| AGO | Angola (ISO 3166 Trigram) |
| MD | Fifteen Hundred (in Roman Numerals) - Maryland (postal Symbol) -Medicinae Doctor (Doctor Of Medicine/Medical Doctor) - Mentioned In Dispatches (military) -Moldova (FIPS 10-4 Country Code; ISO 3166 Digram) |
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