Indicator lamp explained

An indicator lamp (or indicator light) is an illuminated device that is intended to visually convey a single status to the user of a piece of equipment.

Indicator lamp may refer to:

• Check engine light, a tell-tale warning light in automobiles
• Tell-tale (automotive), a more generic class of indicators
• A specific style of indicator light fixture or component, such as a:
  • Neon glow lamp, a miniature gas-discharge lamp
  • Digitron / cold cathode display / Nixie tube, an electronic device used for displaying numerals or other information using glow discharge
  • Roto-Tellite-style light, a type of panel-mounted light (commonly used in aviation / aerospace / military Annunicator panels throughout the second half of the 20th century) where the nameplates individually rotate to quickly facilitate replacement of failed bulb(s) while the remainder of the panel remains in operation

See also

• Search Wiktionary for indicator lamp or indicator light