WordReference Random House Unabridged Dictionary of American English © 2025
call let′ters, 
  1. Show Businessletters of the alphabet or such letters in combination with numbers for identifying a radio or television station, an amateur radio transmitting device, or the like. Also called call sign. 
  • 1910–15

'call letters' also found in these entries (note: many are not synonyms or translations):

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