| Acronym | Meaning |
 | MPEC | Minor Planet Electronic Circular |
| NKVD | Narodnyi Komissariat Vnutrennikh Del (Russian People's Commissariat Of Internal Affairs) (1934-1954) |
| MRI | Magnetic Resonance Imaging |
| XPD | Palladium Troy Ounce (ISO 4217 Currency Code) |
| FEDEP | Federation Development Process (Simulation) |
| KTS | Knight Of The Tower And Sword (of Portugal) |
| SEAWIFS | Sea-Viewing Wide Field Of View Sensor (satellite Instrument) |
| SCOTUS | Supreme Court Of The United States |
| MSL | Mars Science Laboratory - Mean Sea Level -Missile |
| MAR | Morocco (ISO 3166 Trigram) |
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