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The name of a 9 sided polygon is Nonagon.
The name of a 9 sided polygon is nonagon or enneagon.
A polygon with 9 vertices and 9 sides is a nonagon.
A polygon with nine vertices also has nine sides, and is therefore a "nonagon".
A heptagon is a 7-sided polygon, so a heptagonal prism is a 3D version of that (9 sides, 21 edges, 14 vertices).