What?  The Mathematical Zorro was my alter ego at summer math camp at the Ross Mathematics Program at Ohio State University in 1995.  Dr. Ross would start every day by writing a $\mathbb{Z}$ in the upper left hand corner of the blackboard.  Since I was always one of the first to class, I decided to write the $\mathbb{Z}$ myself—and as I became more confident, I replaced the integers by other sets.  I fancied myself The Mathematical Zorro.