A set of nine is called a nonuple. The term "nonuple" is derived from the Latin word "nonus," meaning ninth. In mathematics, a nonuple refers to a collection or grouping of nine elements or objects.
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For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.
It is called a nonagon and/or an enneagon. They belong to the greater family of polygons.
Enneahedral
it is called a nonagon.
A nine sided two dimensional shape would be called a nonagon. Nona is a common prefix meaning nine of something.