Octahedron
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The answer is a polyhedron
Octahedrons.
Octohedron, or rhomboid.
diamond/octahedron
A polyhedron with 9 faces: a nonahedron.A polyhedron with 9 faces: a nonahedron.A polyhedron with 9 faces: a nonahedron.A polyhedron with 9 faces: a nonahedron.