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   W6KME (w6kme@mastodon.radio)'s status on Wednesday, 11-Jun-2025 22:58:34 JST W6KME

   in reply to

   @tk It's complicated. Originally, everyone picked their own, but by 1927 the need was there for international coordination and the ITU assigned letters to countries. Those apply to loads of things beside amateur radio-airplane tail numbers use the same system for example. We have multiple initial letters simply because the US has had the need for so many calls.

   Good article here-
   https://www.eham.net/article/38849