• noun something which shows the state of something else
  • noun a substance which shows that another substance is present
  • noun an organism whose presence or absence in an environment indicates conditions such as oxygen level or the presence of a contaminating substance
  • A component, circuit, device, instrument, piece of equipment, machine, or mechanism which conveys information pertaining to a magnitude or quantity. Said especially when the information is communicated visually. There many examples, including meters, indicator lamps, gauges, monitors, and so on.
  • A needle, dial, or other object which serves to convey information in a meter, gauge, or similar device or instrument.
  • A device, instrument, or piece of equipment which displays the information obtained by another device, instrument, or piece of equipment. For instance, a radar display.

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