An Octagon.
octagon
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A 2-Dimensional shape with 8 sides is called an Octagon.
A Square has 4 sides, the shape you want that has twice as many sides as this is called a Octagon. ( Oct = 8 - as in Octopus ).
what is a shape that have 8 sides
A shape with 8 sides is an octagon
A shape with ten sides is called a decagon