Sentence:  <WSD>"Blinkenlight</WSD> … An indicator light. … The <WSD>blinkenlight</WSD> interface is used to switch on and off an indicator light, …" &mdash; <WSD>Blinkenlight</WSD>, Interface Specification, Coroware Support Pages for Player 3.01, 2005 <!--http://support.coroware.com/Player_3.0.1/group__interface__blinkenlight.html--> 
Meaning of the word marked with <WSD> tags:  A status light on an electronic or electric device such as a modem, router, network hub, and so forth.