Hmm.  I'm a mathematician/computer scientist and I know significantly more than 1 digit of pi.  What does that make me, hmm? :-)<p>Offhand (<i>mentally recites pi</i>) I can come up with about 10 digits without using a calculator.  If I ever need an approximation to pi to do a calculation, though, I go with either 22/7, 355/113, or 3.14159.