A nonagon is a 2D shape and there is not a 3D equivalent shape.
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A nonagon is a 2D shape so you cannot make a 3D nonagon!
Well honey, a 3D nonagon is simply called a "nonagon" because the term "3D" is already implied by saying it's a shape. So, no need to get fancy with the terminology here. Just call it like it is and move on with your fabulous self.
2D - Nonagon 3D - Nonahedron
nonagon
nonagon