An octagon.
Its a shape with 8 sides its a closed figure too!
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There are 8 sides in the polygon with 8 sides (an octagon).
A polygon with 1,000 sides is known as a chiliagon. A hectogon is a polygon that has 100 sides, and a polygon with 8 sides is called an octagon.
A polygon with 5 or more sides can be a stop sign it has 8 sides.
hexagon
octagon