The spritsail is a form of three or four-sided, fore-aft sail and its rig.
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Petty officers, like all senior rates, wear fore and aft rig.
From the en.wikipedia.org
But this rig fell from favour to fore-and-aft gaff rigs and bermuda rigs after the development of steam power and new materials.
From the en.wikipedia.org
The development of the rig is thought to have begun with fore-and-aft rigged boats built by a Dutch-born Bermudian in the 17th Century.
From the en.wikipedia.org
A fore-and-aft rig is a sailingrig consisting mainly of sails that are set along the line of the keel rather than perpendicular to it.
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The tall masts and triangular fore-and-aft sails reminded some people of Marconi's wireless towers, hence the rig became known also as the Marconi rig.
From the en.wikipedia.org
The Bermuda sail makes its appearance and with it the fore and aft rig is poised to definitively take over from the traditional square rigs.