A device to rapidly cool wort. Usually copper tubing that has cold water running through it. Sometimes 2 tubes, one inside the other, with wort going through one and cold water going through the other. Also called a heat exchanger.

Device used in cooling wort. Typically two types: immersion, which is put into the wort and cold water run through it, and counter-flow wherein hot wort goes through a thin copper line that is inside of a larger hose that cold water is flowing in the opposite direction.

a coil of copper tubing that sits in the wort (unfermented beer) and cold tap water is run through the tube, which cools the wort

a nifty little device availiable at most brewshops

See heat exchanger.