The "Curl" - It's Called Curling Because...

A player delivering a stone gives it a slight spin upon release.  The ideal amount of spin will cause the stone to make no more than three complete rotations as it travels the length of the ice.  The spin allows the stone to travel in a curved path as it approaches the house.  The curved path is called the curl.  How much a stone curls depends on the amount of spin, the speed of the stone and the ice conditions.  The faster the stone is traveling, the less it will curl.  It's counterintuitive, but more spin does not equal more curl!