Indicator

usgb/ˈɪndɪkeɪtər/Volume
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Context MattersPlay
Indicator's meaning changes with context; it may refer to symptoms in health or trends in economics. SlideRising unemployment rates are a worrying economic indicator.
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Broad UsagePlay
The term is used in daily life as well as specialized fields to point out critical information. SlideDark clouds are an indicator that rain might be coming.
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Not Always VisiblePlay
Indicators may be intangible, like a feeling indicating something is wrong. SlideA sudden feeling of anxiety was an indicator that he was nervous about the test.