octahedron
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A dodecahedron is a polyhedron with 12 faces.A dodecahedron is a three-dimensional shape having twelve plane faces.
I suggest a 3-dimensional star shape, each of whose faces are not plane but concave.
There are many plane shapes comprising 4 squares and 2 rectangles but there is no such 3-dimensional shape.
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No, a square is a two dimensional plane figure.