ITU-R
The ITU Radiocommunication Sector (ITU-R) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU) and is responsible for radio communication.
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Q code
The Q code is a standardized collection of three-letter codes all of which start with the letter "Q".
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References
[1] https://en.wikipedia.org/wiki/Maritime_Mobile_Service_Q_Codes