OK, you see my avatar? That's a derivative symbol created by writing my initials (BDR) in the same place, then simplifying and elaborating a little. Eventually, I got to the point where I'd scribble it down really fast. And start making little 'ching ching' noises in my head, like I was slashing it Zorro-style onto some villain. So, logically, I started calling this my 'slash'. (Or 'chop', which I think is supposed to be some kind of personal mark/signature - just reinforcing the concept.)
And a while later I decided to put a slash into slash, and spent a long time agonising over the correct capitalisation of the new word. So now you have 's/LaSH', pronounced 'eslash', slurred so you can't tell whether I'm saying 'ess-lash' or 'eh-slash'.
It's a very violent name, now that I think about it...