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.
Either a nonagon or an enneagon. Whichever floats your boat.
A 2d nine sided shape is called a nonagon.
A nine sided polygon is called a "nonagon"
Nonagon.
A nine sided shape is called a nonagon.
A nine sided shape or polygon is called a nonagon.
A nine sided shape is called a nonagon.
nonagon
It is a nonagon
Nonagon