It is called either a Sidagon or an Undecagon.
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An 11-sided shape is called a hendecagon or undecagon. In Greek, 'hendeka-' has the meaning of eleven and '-gon' means corner. The word hendecagon is derived from these two Greek words.
An eleven sided polygon (2D shape with straight sides) is called a Hendecagon.I often set this as a research puzzle for my mathematics classes!
A hendecagon is a regular eleven sided polyhedron. It is an unusual shape that is not normally seen in nature.
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
The name of a 11 sided polygon is Hendecagon.