blazon

A flashing or strobing light triggered by an intercom's "Call Signal," used to alert someone who does not normally wear a headset (especially Monitor and FOH engineers).

View attachment 7127
http://www.beltpack.com/blazon4.html

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Clear-Com FL-7 Call Signal Flasher

For less obtrusive uses, an LED fitted into an XLR connector:
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http://www.nifty-gadgets.com/Com-bits.htm
[file]Image:a_Blazon4.gif|thumb[/file][file]Image:SingleCom-bit.jpg|thumb[/file][file]Image:1247374935FL_7.jpg|thumb[/file]