Trysail

A small triangular sail hoisted at the masthead to help stabilise a boat in heavy winds. 

A trysail is a small triangular sail that is hoisted at the masthead of a boat to help stabilise the vessel in heavy winds. It is typically used as a storm sail when the wind is too strong for the boat’s regular sails to handle. The trysail is designed to reduce the heeling and weather helm of the boat, making it easier to control in challenging weather conditions. It is a valuable piece of equipment for sailors who need to navigate through rough seas safely.