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.[1]

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  The highest sail is moonraker, lower skysail and royal sail.
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  Skysail is the highest on the main (middle) mast.
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References

1. King, Dean (2000). A Sea of Words (3 ed.). Henry Holt. p. 404. ISBN 978-0-8050-6615-9.