Recent Examples on the WebAt least show some imagination and go for a heptagon next time. Nate Davis, USA TODAY, 9 Sep. 2022 Nearby, the bug must make seven such turns, signifying a heptagon with an equal and opposite amount of negative curvature, the kind in a saddle.Quanta Magazine, 6 Jan. 2015
Word History
Etymology
Greek heptagōnos heptagonal, from hepta + gōnia angle — more at -gon