It is an undecagon which has 11 sides.
Eleven sided shapes are usually called hendecagons, which uses the greek for eleven - Hendeka and corner -gon. However they can also be termed as undecagons or unidecagons.
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Decagon. A decagon is the name of a ten sided shape.
A 10-sided shape is a decagon.
A Pentacontagon is a fifty sided shape ...
hendecagon
hundred sided shape is called a chlligon