Some fonts created for use with personal computers produced the "0" character much more squared at the edges, like a rectangle, plus the "O" character much more rounded. A further difference is manufactured in falsification-hindering typeface as used on German motor vehicle range plates by slitting open the digit https://financefeeds.com/hk-sfc-reports-capital-markets-resurgence-through-innovation-tokenisation-and-cross-border-expansion/