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Yours, Etc.: Origins and Uses of 8 Sign-Offs

call letters

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.
Also called call sign.
Origin
1910-1915
1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for call letter

call letters

plural noun
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
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Difficulty index for call letters

Few English speakers likely know this word

Word Value for call

6
9
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