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call letters

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plural noun
  1. letters 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.

Origin of call letters

First recorded in 1910–15
Also called call sign.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for call letters

call letters

pl n
  1. the call sign of an American or Canadian radio station, esp that of a commercial broadcasting station
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012