the.com/indicator
A number that tells you what already happened, dressed up as foresight.
means A measurable sign that reveals the state, direction, or likely behavior of something larger.
from From Latin 'indicare,' to point out or reveal — literally a pointing finger made of data.
Lagging vs leadingSome predict the future, most just confirm the past.
Chemistry toopH indicators change color to flag invisible acidity.
Car versionThe blinker nobody seems to use.