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An object that exists in three dimensions is called a solid.
It is a solid object and so has 3 dimensions.
solid
A rectangular solid is a polygon, as it is a four-sided, six face object. In two dimensions, it will remain a polygon with intersecting lines at the interior, with no line exceeding the boudary of the edge of the object from any point of view.
A prism is a solid geometric object. If you know its shape and dimensions you can calculate its volume.