An octahedron.
It could be in the form of
a heptagonal pyramid,
a hexagonal prism, or
a rectangular dipyramid (two rectangular pyramids stuck together along their bases).
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A cube is one
Yes, it certainly is!
octagon-2D Octahedron-3D
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
Nonahedron.