This doesn't have to be English, it could also be a symbol or some other language. I have not tried anything.

  • Define "longest": Most bytes to represent? Longest width relative to height in a standard font? Something else? – manassehkatz-Moving 2 Codidact Feb 7 '19 at 2:47
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    Can you add more context why are you exploring this. Validation check for some thing? Research? Deciding some UX? – Ankur Feb 7 '19 at 3:28
  • I'm voting to close this question as off-topic because it has nothing to do with UX – colmcq Feb 7 '19 at 14:04

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!

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    This depends entirely on the font used, I once worked with one where the "4" was the widest number. – Levano Feb 7 '19 at 6:16

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