For a plain 2-dimensional figure it is an OCTAGON.
For a 3-dimensional object it is an OCTAHEDRON.
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octagon
Pentagon 2d shape is a pentagon 3d object is a pyramid.
a octagon
octohedron
A 150-sided shape is called a hecatontagon. The prefix "hecta-" is derived from the Greek word for one hundred, and "-gon" is a suffix used for shapes with a specific number of sides. Therefore, a 150-sided polygon is specifically referred to as a hecatontagon.