The equivalent of a octahedron as a 2D shape is an 8 sided octagon.
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An octahedron is not a polygon. A polygon is a two dimensional shape. An octahedron is a three dimensional shape and is classified as a polyhedron.
octahedron
An octahedron is a 3-dimensional shape with 8 faces. There are 257 topologically distinct convex octahedra, They can have a maximum of 18 edges.
An octahedron is an eight-sided polyhedron (which is a three-dimensional polygon).
A three-dimensional shape with eight triangular faces is called an octahedron.