octahedron (or plural: octahedra). Check on wikipedia or any other websites if you're still unsure.
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a Dodecahedron is a 3 diamentional shape having 12 plain faces in a regular solid figure with 12 equal pentagonal sides!
If they are plane faces the shape is likely to be a polyhedron.
oblong
octahedron
An irregular polyhedron if it has plane faces. If not, then there usually will not be a name for it.