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call sign

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noun
  1. call letters.
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Origin of call sign

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for call sign

call sign

noun
  1. a group of letters and numbers identifying a radio transmitting station, esp an amateur radio stationCompare call letters
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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