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hendecagon
A two-dimensional eleven-sided figure is called a hendecagon.
A figure with five sides is a pentagon.
Any figure with 6 sides is a Hexagon. If all sides of the figure are of the same length, and all interior angles are 120° then you have a regular hexagon.
The best name seems to be hendecagon (from the Greek word for "eleven").See http://mathworld.wolfram.com/Hendecagon.html.