I used a reverse-slashed zero in my programming font [1][2] for exactly that reason. I wanted it to be clearly distinct from an O with stroke (and by more than

I used a reverse-slashed zero in my programming font [1][2] for exactly that reason. I wanted it to be clearly distinct from an O with stroke (and by more than just the slash not extending past the bowl). [1] http://eastfarthing.com/luculent/ http://eastfarthing.com/luculent/ [2] https://usemodify.com/fonts/luculent/ https://usemodify.com/fonts/luculent/