| Meaning | A device for showing the operating condition of some system. |
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| Narrower | annunciator | An indicator that announces which electrical circuit has been active (as on a telephone switchboard) |
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| cursor, pointer | (computer science) indicator consisting of a movable spot of light (an icon) on a visual display |
| dial | The circular graduated indicator on various measuring instruments |
| fuel gauge, fuel indicator | An indicator of the amount of fuel remaining in a vehicle |
| gnomon | indicator provided by the stationary arm whose shadow indicates the time on the sundial |
| level, spirit level | indicator that establishes the horizontal when a bubble is centered in a tube of liquid / liquid |
| pilot light, pilot lamp, indicator lamp | indicator consisting of a light to indicate whether power is on or a motor is in operation |
| pointer | An indicator as on a dial |
| scale | An indicator having a graduated sequence of marks |
| test paper | paper impregnated with an indicator for use in chemical tests |
| tidemark | indicator consisting of a line at the highwater or low-water limits of the tides |
| Broader | device | An instrumentality invented for a particular purpose |
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| Spanish | indicador |
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| Catalan | indicador |
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