A hendecagon.
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I want to say hendecahedron-- is that close?
11-sided QuadrilateralAn 11-sided quadrilateral is called a hendecagon.
What is a 12 sided object called?A twelve sided object is called a dodecagon. I'm glad I could help. =)
It is called hendecagon.
A five sided 2 dimensional object is called a pentagon.