A hexakaidecagon (hexadecagon).
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The name of a 16 sided polygon is Hexdecagon.
I think it's called a decahexagon
octagon
Decagon.
the Greeks used prefexes up to ten, modernly we have sdded dodecagon for a twelvesided object and undecagon for an eleven sided object so the propor name would be a 27 sided object.