Polygonal Oddities

This is a crazy collection and categorization of mathematical oddities.

http://www.recmath.org/PolyCur/p6odd/index.html

Here, the word oddity has a specific, technical mathematical meaning:  an oddity is a figure with at least one line of symmetry that is made up of an odd number of copies of some polygon.

I’ve never heard of oddities before, and I learned a lot of new vocabulary words while exploring this page:  polyform, hexapent, and quinquerotary, to name a few!