It is a nonagon
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A nine sided shape is called a nonagon.
The name is 'Enneagram'. A geometric shape like a 9-pointed star.
draw an octagon then erase one corner and connect it
A 39-sided shape is called a "triacontaenneagon." The name is derived from the Greek prefixes "triaconta-" (meaning thirty) and "-enneagon" (meaning nine-sided polygon). The triacontaenneagon has 39 sides, 39 angles, and 39 vertices.
A million sided shape shape is called a megagon.