True story. In my teens I got a hold of the BBC Micro assembly programming manual; 6502, in all its 8-bit glory. I didn't understand much English, and I haven't had much 1-on-1 time with a computer in my life (paper hacking) so when I got that book, I was completely dumbfounded and confused by the zero with a strike through. I have never seen this symbol before in my life, and now I don't see it anywhere on the keyboard. <i>sigh</i>.<p>Good news though. A few months later I was programming in Forth, learning from a self-xeroxed copy of Starting Forth, and it had the zero-slash everywhere. I am not sure when did I realize that Ø == 0. (It looks like the empty set, aka "phi" Φ)<p>[Edit: <a href="http://en.wikipedia.org/wiki/%C3%98_%28disambiguation%29" rel="nofollow">http://en.wikipedia.org/wiki/%C3%98_%28disambiguation%29</a>  ]