Some fonts designed for use with personal computers built the "0" character a lot more squared at the edges, like a rectangle, plus the "O" character extra rounded. A further difference is made in falsification-hindering typeface as used on German auto selection plates by slitting open the digit 0 https://financefeeds.com/copyright-launches-bitcoin-staking-via-babylon-protocol-offering-yield-without-wrapping-or-bridging/