It can be called an 85-gon or an octacontakaipentagon.
The second is not at all common, it is simply constructed based on the pattern of naming other polygons, most polygons with more than twelve sides are simply called (the number)-gons.
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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 2d nine sided shape is called a nonagon.