No, it's a novelty coin, manufactured specifically for people who want to know what the results will be when they flip a coin.
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A cube has 6 square faces, while the 6 faces on a rectangular prism are rectangular.
A quadrangular is an adjective, not a noun. A quadrangular pyramid will have a different number of faces from a quadrangular prism, for example.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons.