Some fonts created for use with desktops designed the "0" character more squared at the perimeters, like a rectangle, as well as "O" character much more rounded. An additional difference is designed in falsification-hindering typeface as used on German motor vehicle number plates by slitting open the digit 0 https://financefeeds.com/unverified-reports-emerge-on-potential-u-s-seizure-of-ripple-s-xrp-escrow/