It is a bit like a circle with a curved tangent emerging from it. Not sure that it has a name!
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A seven sided figure is called a heptagon.
A four sided figure is called a quadrilateral.
A 12-sided figure is called a dodecagon.
The distance around a figure is called the "perimeter", unless the figure is a circle - in that case, it is called the "circumference".
If the figure is 2-dimensional, it is called the perimeter.