Skysail ?

Where does the domain name come from ? This definition and diagram are from the The Oxford Companion to Ships and the Sea:  

SKYSAIL: The name of the sail set next above the royal in a square-rigged ship, the sixth sail in ascending order from the deck, its two tacks secured to the ends of the yard on which the royal is set. Like the royal, it is a light-weather sail, set only when the wind is steady and favourable. See also KITES, and for illus. SAIL.  

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