yacht this was the original answer but this can refer to a powered vessel too. As in motor yacht. A one masted fore and aft rigged vessel is called a sloop and can have various sail plans e.g. Gaff rigged, bermudian rigged
It is a "sloop", said to be "sloop-rigged".
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A brig is a two-masted square-rigged ship with an additional gaff sail on the mainmast. A brigantine is almost exactly the same but without the gaff sail, and the mainmast is fore and aft rigged.
If the mainsail is rigged for and aft it's most often called a sloop.
A single-masted sailing vessel is called a 'sloop-rigged' vessel.
A single-masted sailing vessel is called a 'sloop-rigged' vessel.
Presuming you are referring to a gaff-rigged main sail, that diagonal pole would be the boom.
Two sailing vessels appear on the seal. both of which represent different aspects of the New York Maritime experience. The single masted sloop represents the North/South Hudson river experince of the river as a transportation route to the interior. The Gaff rigged three master represents the Ocean shipping essential to International trade and commerce.
A single-masted, fore-and-aft-rigged sailing boat with a short standing bowsprit or none at all and a single headsail set from the forestay.
A single-masted, fore-and-aft-rigged sailing boat with a short standing bowsprit or none at all and a single headsail set from the forestay.
Ketch, sloop ---\\\--- Sorry, but a sloop has only one mast, a ketch only carries two. Brigs, barques, brigantines, carracks and square-riggers are different types of traditionally-rigged three-masted ships.