indicator
//ˈɪndɪkeɪtər//
Noun
indicatorSingular
indicatorsPlural
1
A thing that shows or points to the state or level of something; a sign or measure.
Economic growth is a key indicator of a country's prosperity.
2
A device or instrument that displays a measurement or condition, such as a gauge or dial.
The fuel indicator shows that the tank is nearly empty.
3
A flashing light on a vehicle that signals the driver's intention to turn left or right.
Don't forget to use your indicator when changing lanes.
4
A substance that changes color to show the presence or concentration of a chemical, especially in chemistry.
Litmus is a common indicator used to test whether a solution is acidic or basic.