| Acronym | Meaning |
| FWF | Fixed Word Format |
| THA | Thai Language (ISO 639-2 Code) |
| YN | Yottanewton |
| ZUL | Zulu Language (ISO 639-2 Code) |
| ITU | Intent-to-Use - International Telecommunication Union (International Telegraph Union 1865-1932) |
| ROK | Republic Of Korea |
| CMPD | Chronic Myeloproliferative Disease |
| XIII | Thirteen (in Roman Numerals) |
| NAV | Navigation[al] |
| BOAC | British Overseas Airways Corporation (predecessor Of British Airways) |