Scrabble?! INDICATOR

Definitions of INDICATOR in various dictionaries:

noun - a number or ratio (a value on a scale of measurement) derived from a series of observed facts

noun - a signal for attracting attention

noun - a device for showing the operating condition of some system

noun - (chemistry) a substance that changes color to indicate the presence of some ion or substance

A pointer or an index.

An instrument used to monitor the operation or condition of an engine, a furnace, an electrical network, a reservoir, or another physical system; a meter or gauge.

The needle, dial, or other registering device on such an instrument.

Any of various substances, such as litmus or phenolphthalein, that indicate the presence, absence, or concentration of another substance or the degree of reaction between two or more substances by means of a characteristic change, especially in color.

Any of various statistical values that together provide an indication of the condition or direction of the economy.