I do belive its called a quinterron.
quinterron
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100 sides will be a hectogon or hecatontagon
It is a just called a 100-gon. There isn't any fancy name for it.
quinterron
a shape with 100 sides
A shape with 100 sides is called a hecatontagon. The prefix "hecto-" means 100 in Greek, so a hecatontagon is a polygon with 100 sides. It is a regular polygon, meaning all its sides are of equal length and all its angles are equal.