Ear
A Principal Vertex 
of a Simple Polygon 
is called an ear if the diagonal 
that bridges lies entirely in . Two ears and 
are said to overlap if
The Two-Ears Theorem states that, except for Triangles, every Simple Polygonhas at least two nonoverlapping ears.See also Anthropomorphic Polygon, Mouth, Two-Ears Theorem
References
Meisters, G. H. ``Polygons Have Ears.'' Amer. Math. Monthly 82, 648-751, 1975. Meisters, G. H. ``Principal Vertices, Exposed Points, and Ears.'' Amer. Math. Monthly 87, 284-285, 1980. Toussaint, G. ``Anthropomorphic Polygons.'' Amer. Math. Monthly 122, 31-35, 1991.
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