It is called a nonagon and/or an enneagon. They belong to the greater family of polygons.
A nine sided POLYGON is called a nonagon. Any plain shape bounded by nine straight sides is a nonagon.
A nine sided shape would be called a " Nonogon".
A 2d nine sided shape is called a nonagon.
Nonagon.
A nine sided shape is called a nonagon.
A nine sided shape or polygon is called a nonagon.
It is a nonagon
A nine sided shape is called a nonagon.
nonagon
Nonagon
A nonagon is a nine sided shape.