Easy answer: a star icon or the apple logo are examples of what a concave polygon looks like.
A concave polygon has 1 interior angle greater than 180 degrees.
you can see an example on:
http://en.wikipedia.org/wiki/Convex_and_concave_polygons
http://www.mathopenref.com/polygonconcave.html
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Is a concave polygon.
A concave angle is an angle, of a polygon that caves in.
concave polygon
A concave polygon has lines that curve inwards whereas a convex polygon has lines that curve outwards and they are found on and inside spheres
It is a concave or reentrant polygon.