Octahedron
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A 3-D shape with 8 faces is an octahedron.
Its a Octagon * * * * * No. An octagon is a shape with 8 sides. 8 faces implies a 3-dimensional object, which would have to be an octahedron.
Octahedron
octahedron
An octahedron: two quadrilateral based pyramids with their bases together.