call letters

call letters pl (plural only)

1. (broadcasting) Call sign.
   • 2019 September 17, Edward Snowden, Permanent Record, New York, N.Y.: Metropolitan Books/Henry Holt and Company, →ISBN:

     I left my smartphone on the kitchen counter alongside a notepad on which I scribbled in pen: Got called away for work. I love you. I signed it with my call-letter nickname, Echo.