See: http://mathworld.wolfram.com/Radical.html
     http://www.achewood.com/index.php?date=05152002

In mathematics, a radical is a funny symbol that has something to do with roots
of stuff, or something.

That is totally beside the point.  Divmod Radical is called radical because it
is rad*.  It is a web-based multiplayer game.

*: It is not rad to have alcoholism.