Short answer: BECAUSE I CAN. Long answer: (DEEP BREATH) A long time ago, I decided to start putting slashes in my zeroes when writing them. At the time, I thought it was kind of cool. Nobody seemed to be doing it and it was a clear way to differentiate the number zero from the letter O. And there was something oddly satisfying about drawing the perfectly aligned diagonal line through a zero (to this day, it's still hit and miss as far as aim goes, but I suspect that's a condi