"Octagonal shape" refers to a shape that has eight sides and eight angles, forming a flat figure that resembles a stop sign or a regular octagon. Full definition
Both have odd octagonal shapes with large and sharp edges at the top and bottom. (androidcentral.com)
On the northern end of the island is another small resort, Via Vaccare, with octagonal shaped rooms on the beach, offering peaceful island breaks, and yoga and meditation sessions for those who wish to participate. (gili-paradise.com)
Surrounded by the majestic Ozark Mountains, the 4,500 - square - foot octagonal shaped lodge is built of natural materials such as fieldstone and red cedar and features wrap - around decks, massive stone fireplaces, and floor - to - ceiling glass walls with 320 - degree views of the surrounding forest and river. (vacationidea.com)