Indicator
/ˈɪndəˌkeɪtər/
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Definition
(noun) A pointer or index that indicates something.
Sentence Examples
Rank smells are a clear indicator that food should be thrown away.
You forgot to drop the indicator, that's why it never changes its color.
CEFR Practice Quiz
The flashing red light on the dashboard is a clear ____ that the car is running out of oil.