As a 2D polygon shape it is an 8 sided octagon.
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An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons.
An octahedron is a 3D shape with 8 sides.
octahedron
8 octagons
the flat ones