Anthropomorphic polygon

In geometry, an anthropomorphic polygon is a simple polygon with precisely two ears and one mouth.

red denotes a non-principal vertex, green denotes an ear and blue denotes a mouth

an illustration of the diagonals of the polygon. Blue denotes non-self-intersecting and red denotes self-intersecting. The diagonals determine the vertex type.

References

• Weisstein, Eric W., "Anthropomorphic polygon" from MathWorld.