What characters cannot be written on a passport? [closed]

What characters cannot be written on a passport? [closed] - Focus Photo of Super Mario, Luigi, and Yoshi Figurines

Apparently the letter ü cannot be written on Chinese passports. They opt for instead writing ü as:

yu

The name lü would get rendered as:

lyu

Is this an international issue? What other characters (or letters) cannot be written on passports?






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Where Your Passport Can't Take You




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