Definitions
1.NounA pointer or index that indicates something.
2.NounA meter or gauge.
3.NounThe needle or dial on such a meter.
4.NounAny of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction.
5.NounA plant or animal whose presence is indicative of some specific environment.
6.NounA measure, such as unemployment rate, which can be used to predict economic trends.
7.NounA turn signal; each of the flashing lights on each side of a vehicle which indicate a turn is being made to left or right, or a lane change etc.
8.NounA bird, the honeyguide.
9.NounA codeword that marks the use of a specific cryptic device.