An n-gon, or if you know the number of sides, use Greek prefixes + ...gon
Some examples:
Pentagon or pentahedron: (n = five),
Decagon or decahedron: (n = ten),
Dodecagon or dodecahedron: (n = twelve),
Icosagon or icosahedron: (n = twenty).
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N is a KABOB
Any n-sided polygon (n being any integer) will always have a minimum of n-2 triangles inside the shape, assuming that the polygon is regular with no reflex angles.
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.
The name of a polygon with 20 or more sides is called "n-gon".
n-gon