Cricket

noun

1. An insect in the order Orthoptera, especially family Gryllidae, that makes a chirping sound by rubbing its wing casings against combs on its hind legs.
2. A wooden footstool.
3. A signalling device used by soldiers in hostile territory to identify themselves to a friendly in low visibility conditions.
4. A relatively small area of a roof constructed to divert water from a horizontal intersection of the roof with a chimney, wall, expansion joint or other projection.