Nonagon is the name of a 9 sided shape. The US Steel Tower in Pittsburgh, Pennsylvania is a nonagon.
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A nonagon
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A nine sided shape or polygon is called a nonagon.
icosikaidigon is a 22 sided shape