This doesn't have to be English, it could also be a symbol or some other language. I have not tried anything.
closed as unclear what you're asking by locationunknown, Matt Obee, colmcq, JonW♦ Feb 7 at 14:09
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I am not sure about the other language characters such as Chinese/Japanese but the widest character where the english alphabet is used must be upper case W. The widest number Is 8. Hope that helps!