Some Fonts created for use with desktops produced the "0" character far more squared at the sides, like a rectangle, along with the "O" character extra rounded. A further distinction is built in falsification-hindering typeface as used on German auto range plates by slitting open the digit 0 on https://financefeeds.com/wfe-welcomes-eu-savings-and-investment-union-push-but-urges-shift-to-growth-oriented-reforms/