A tiller or till is a lever attached to a rudder post (American terminology) or rudder stock (English terminology) of a boat that provides leverage in the form of torque for the helmsman to turn the rudder. The tiller can be used by the helmsman directly pulling or pushing it, but it may also be moved remotely using tiller lines or a ship's wheel.Rapid or excessive movement of the tiller results in an increase in drag and will result in braking or slowing the boat.