The yards ( highlighted in green ) are the horizontal spars that are connected to the masts. the square sails are connceted to the yards and they can be made from wood or steel. They have individual names relating to which mast they are attached to, the lowest is called the LOWER YARD and working upwards LOWER TOPSAIL YARD, UPPER TOPSAIL YARD, LOWER TOPGALLANT YARD, UPPER TOPGALLANT YARD, ROYAL YARD and SKYSAIL YARD. The end tip of the yard is known as the YARD ARM.