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An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Some simple octahedra are
- a regular octahedron (also known as a square-based dipyramid or triangular antiprism)
- heptagon-based pyramid
- hexagon-based prism.
So an octahedron is not a single shape.
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