Decagon.
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octagon
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.
A hexakaidecagon (hexadecagon).
HEXADECAHEDRON is the correct name for a 16 sided 3D object
There is no such thing as a two-sided object.