If a polygon has 8 sides, what is it called?

A polygon with 8 sides is called an octagon. The term "octagon" derives from the Greek word "okto," meaning eight. This naming convention follows a standard pattern in geometry where the prefix indicates the number of sides. For example, a hexagon has 6 sides and a heptagon has 7 sides. A nonagon, by contrast, has 9 sides. Therefore, when identifying a polygon specifically by the number of its sides, octagon is the accurate term for a figure with 8 sides.