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Slashed or dotted zero to differentiate from O #33
Worth noting: Public Sans is a text/UI font, not a monospace or coding font. Most text/display typefaces don’t have slashed or dotted zeros.
Generally if you have ID numbers or other contexts where 0/O differentiation is important, you would use a different typeface for those elements.
The US Web Design System, of which Public Sans is a part, currently specifies Roboto Mono (which does have a slashed zero) for this purpose. See https://v2.designsystem.digital.gov/components/typography/