Indicator (statistics)

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In statistics and

variable, or in other words "a sign of a presence or absence of the concept being studied".[1]
Just like each color indicates in a traffic lights the change in the movement.

For example, if a variable is religiosity, and a unit of analysis is an individual, then that one of potentially more numerous indicators of that individual's religiosity would be whether they attend religious services; others - how often, or whether they donate money to religious organizations.[1]

Numerous indicators can be aggregated into an index.[2]

The complexity of biological systems makes evaluating them a challenge.

sustainability indicators or the genuine progress indicator. Standard measurements are given in the OECD Main Economic Indicators. A famous popular science individual psychological assessment is the Myers–Briggs Type Indicator