Check out any street corner- a stop sign is an octagon .
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An octagon is composed of eight sides.
an octagon * * * * * An octagon need not have equal sides. For that it would have to be an equilateral octagon (though not necessarily regular).
An octagon is an eight-sided two-dimensional object. If each of the eight sides to an octagon were concave, it would still be an octagon. So, yes, it could.
a stop sign
As the "octa" at the beginning of the word would imply, an octagon is a shape with eight sides.