Heptagon
Heptagon – A polygon with 7 sides

She heaped until all the snow was gone (heptagon) 7 days a week.
Example 1

A regular heptagon has 7 sides of equal length and internal angles of 128.57 ° between the sides.
Example 2

Although shaped like a V, this is still a 7-sided polygon and can be described as a concave heptagon.
Example 3

Heptagons can be convex such as this one.