Etymology
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indicator (n.)

1660s, "that which indicates or points out," from Late Latin indicator, agent noun from indicare "to point out, show" (see indication). As a finger muscle, from 1690s. As a steam-cylinder's pressure gauge, 1839. As a device on a motor vehicle to signal intention to change direction, 1932.

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Definitions of indicator

indicator (n.)
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time;
Synonyms: index / index number / indicant
indicator (n.)
a signal for attracting attention;
indicator (n.)
a device for showing the operating condition of some system;
indicator (n.)
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction;
From wordnet.princeton.edu