| Acronym | Meaning |
 | EMU | Electric Multiple Unit - A Method Of Connecting Self-propelled Railway Vehicles Together To Form A Train Under The Control Of One Driver. |
| CAD | Canadian Dollar (ISO 4217 Currency Code) -Computer-Aided Design - Computer-Aided Dispatch |
| DCCP | Datagram Congestion Control Protocol |
| PY | Paraguay (ISO 3166 Digram) - Person-Year -Portsmouth Yardstick |
| DDOS | Distributed Denial Of Service |
| FFS | For Fuck's Sake |
| NA | Nanoampere |
| AN | Andorra (FIPS 10-4 Country Code) - Netherland Antilles (ISO 3166 Digram) |
| MMC | Machinist's Mate |
| HR | Croatian Language (ISO 639-1 Code) |
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