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interval signal

British  

noun

  1. a characteristic snatch of music, chimes, etc, transmitted as an identifying signal by a radio station between programme items

"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

Example Sentences

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The Lincolnshire Poacher was so named because of two bars from an English folk song of that name being used as an "interval signal".

From BBC

This is a clock which ticks seconds, known officially as "The Interval Signal."

From Time Magazine Archive

After each word the "Interval" signal is made.

From Project Gutenberg