Skysail

A skysail is the uppermost sail in many old square-rigged sail-plans (though sometimes topped by a moonsail). It was also on the royal mast above the royal sail. It was typically used in light winds.

Image:Regina Maris moonraker and studding 2.jpg, The highest sail is moonraker, lower skysail and royal sail.
Image:Clipper (PSF).jpg, Skysail is the highest on the main (middle) mast.
Image:Square rig names.gif
Image:Moonraker skysail.JPG

References

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Sailing rigs and rigging