A nonagon is polygon with nine sides. Architectural objects with a shape of a nonagon are the U.S. Steel Tower and the Temples of Baha'i Faith. The logo for the band, "Slipknot" is a version of a nonagon.
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A nonagon is a 2D shape and there is not a 3D equivalent shape.
nonagon
A nonagon
A nonagon is a 2D shape so you cannot make a 3D nonagon!
Either a nonagon or an enneagon. Whichever floats your boat.