A ∞ sided shape is called an apeirogon.
It may also be considered a circle, from which it would be practically indistinguishable.
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a finagon
a 4 sided shape is called a quadrilateral
== == A 56 sided shape is called a Pentacontakaihexagon.
A 600-sided shape is a hexcosiagon.
A twelve sided shape is a dodecagon.