It depends on whether you want your readers to know what you are talking about or would rather be pretentious.
I would say 97-gon.
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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.
A five sided 3d shape is called a pentehedron