a dodecahedron
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it is called a nonagon.
There is no such thing as a two-sided object.
It's called a dodecagon or a duodecagon.
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.
The name of a 12 sided polygon is Dodecagon.