Heptagon
/ˈheptəɡɑːn/
Definition 1 of 1
Pro Tip 1/3Geometry Term
Heptagon is specifically used in geometry to discuss shapes with seven sides. 
In geometry class, we learned how to calculate the area of a heptagon.
Pro Tip 2/3Stop Sign Error
A common mistake is to think stop signs are heptagons; they are actually octagons. 
I corrected my friend when she mistook the octagonal stop sign for a heptagon.
Pro Tip 3/3Not Common
Heptagons are less common in daily life than other shapes like triangles or squares. 
While playing a game, we had to think hard to find a heptagon-shaped object.