indicator
http://purl.obolibrary.org/obo/NCIT_C25180
https://en.wikipedia.org/wiki/Indicator_(statistics)
https://www.wikidata.org/wiki/Q18208034
An event, entity or condition that typically characterizes a prescribed environment or situation and determines or aids in determining whether certain stated circumstances exist or criteria are satisfied.
An observed value of a variable, or in other words "a sign of a presence or absence of the concept being studied".
indicators
measurement value