An index is Mathematical aggregation of Indicators or metrics.

Other definition:
An Index (plural = indices or indexes) is an integrative expression of site condition across multiple metrics. An index of Biological Integrity is often composed of at least 7 metric.

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index biasan	Google
woman eating salad and fruits and measuring her waist	Godzilla (5.9) Annotated
Burgernomics Big Mac index 2010	recpection