"Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something."

https://news.ycombinator.com/newsguidelines.html

It's going to blow your mind when you realize all words are made up. Even more so when you find out that definitions change and new words are invented every year.

Though fees may apply, JFYI ;-):

http://www.marriedtothesea.com/030807/dictionary.gif

It's an established mathematical term for these things. Of course, mathematical terms tend to be "made up" at some point, but I don't think that's a useful distinction.

Have you never read any Martin Gardner books ?

The wikipedia page [1] on the things is a good introduction too.

[1] https://en.wikipedia.org/wiki/Flexagon