| Acronym | Meaning |
 | PEN | Peruvian Sol (ISO 4217 Currency Code) -PolyEthylene Naphthalate |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
| XRML | EXtensible Rights Markup Language |
| HFE | Human Fertilisation And Embryology (UK Act) |
| MTOE | Modified Table Of Organization And Equipment (emm-toe) |
| CQ | Carrier Qualification - Central Queensland - Charge Of Quarters - Congressional Quarterly - Constellation Airlines (IATA Airline Designator) - Northern Mariana Islands (FIPS 10-4 Territory Code) |
| MPEV | Multi-Purpose Engineering Vehicle |
| RMS | Rate-Monotonic Scheduling - Richard M. Stallman - Root-Mean-Square - Royal Mail Ship (e.g. RMS Titanic) |
| ROWPU | Reverse Osmosis Water Purification Unit (roe-pew) |
| JFTX | Joint Field Training Exercise |
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