When you get up to many sides, I believe the correct terminology is just N-gon, where N is the number of sides. So this would be 123456-gon.
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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.
A six sided figure is called a hexagon.
A 5 sided figure is called a: pentagon