I'm assuming you mean a 3-d shape with faces of pentagons. This is called a Dodecahedron
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A 3D pentagon could be called a pentagon prism or a dodecahedron which is a Platonic solid with 12 pentagonal faces.
A 3D name for a pentagon is a pentagonal prism.
Oh, dude, a 3D pentagon has five sides and five vertices. It's like a regular pentagon, but in 3D, so it's got some depth to it. Just imagine a 2D pentagon trying to be all fancy and three-dimensional.
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A dodecahedron is a 3-d shape with 12 faces that are regular pentagons.