the.com/indicator

A proxy pretending to be the truth, usually with better PR than the truth.

means A sign, measurement, or reading that points to the state of something you can't directly see or measure yourself.

from From Latin 'indicare' (to point out, show), built from 'in-' (toward) plus 'dicare' (to proclaim, make known) — a relative of 'dictate' and 'dedicate.' It entered English in the 1500s-1600s for things that literally point or signal, long before it picked up its modern life in gauges, economics, and chemistry, where a tiny visible change (a needle, a color shift) stands in for a larger invisible truth.

economics use
GDP is an indicator, not a measure of wellbeing
chemistry use
litmus turns color before it tells the real pH
trading use
most technical indicators lag the price they predict
root word
from Latin indicare, meaning to point out
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