Octagon
Octogon? If so, it's an 8 sided shape. The prefix "octo-" means 8.
An Octogon An Octogon regular regular
octogon
An octogon can be regular (all sides of equal length) or irregular (all sides not of the same length).
octogon
An octogon
octogon
octogon
OCTOgon
octogon
an octogon
An octogon.