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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.
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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
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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