For planar shapes, an eight sided polygon (also simply octagon) is any shape with eight straight sides it does not have to be equilateral (same length on all sides) or equiangular (same angle on all sides) as the regular octagon is.
If you are talking about 3 dimensional shapes the terms are polyhedron & octahedron
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It is an octagon which is an 8 sided shape
octagon
An octagon
An eight sided shape is called an octagon.
A 2-Dimensional shape with 8 sides is called an Octagon.