indicator

Indicator (from Latin indicare "to show") stands for:

Advice , signs or indicators as an aid to new knowledge
Indicator (chemistry) , tool that is supposed to show certain information
Indicator (medicine) , substance that shows a process or condition through a measurable change
Indicator (technique) , feature or sign of a certain development or a condition that has occurred
in cryptology, the reference to a cryptographic key, see saying key
mathematical result of an indicator function

Humanities:

Indicator (economy) , measurement variable for statements on economic development
Indicator (social sciences) , limited sample from a set of empirically testable facts
Indicator (linguistics) , linguistic expression, the meaning of which depends on the context of an utterance

See also:

Wiktionary: Indicator - explanations of meanings, word origins, synonyms, translations