Unexpected examples where 0 can reinforce the point to 1 of the unbroken line of descent from foundations of mathematics. - Kleene Star: The [Kleene Star](https://en.wikipedia.org/wiki/Kleene_star) sounds like a very abstract mathematical thing until we realize it's the `*` from regular expressions. - The related [glob](https://en.wikipedia.org/wiki/Glob_(programming)) syntax came from Unix, and is a sort of "slang" for regular expressions.