1) Eight-sided 2) Like a stop sign 3) Like many gazebos 4) Like some bumper pool tables 5) Like stop signs 6) Octangular 7) Polygon 8) Polygonal shape 1) Eight-sided 2) Octangular 
[horse] Octagonal (foaled 1992) is a retired champion New Zealand-bred, Australian raced Thoroughbred racehorse, also known as `The Big O` or `Occy`. He was by the champion sire Zabeel, out of the champion broodmare Eight Carat, who also produced Group One winners Mouawad, Kaapstad, Diamond Lover and (Our) Marquise. Trained by John Hawkes, ...
• (a.) Having eight sides and eight angles.
Oc·tag'o·nal adjective Having eight sides and eight angles.