warning light

Definitions

Aviation

  • noun a small light, often red, which informs of a possible danger by lighting up

Computing

  • noun a small light which lights up to show that something dangerous may happen

Electronics

  • A light, such as that on a control panel, which provides warning signals. Also called warning lamp.
  • synonymwarning lamp
http://www.dictionarycentral.com/definition/warning-light.html