| Acronym | Meaning |
 | RTG | Radio-isotope Thermoelectric Generator Also Used For Rubber Tyred Gantry Crane |
| INDIGO | (U.S.) INtelligence DIvision Gaming Operation |
| EOM | End Of Message |
| APCNR | Armour-Piercing |
| UNDE | Union Of National Defence Employees (Canada) |
| RPD | Recognition-Primed Decision-making |
| ETA | Estimated Time Of Arrival -Euzkadi Ta Azkatasuna (etta |
| RSA | Regimental Support Area - Republic Of South Africa -Rivest-Shamir-Adleman Encryption |
| HAT | Haitian Creole Language (ISO 639-2 Code) |
| NOC | UK. National Oceanography Centre |
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