A middle ground might be to allow for some Unicode (UTF-8​​) to be
considered letters like a-z,A-Z. Then one could name APL iota to something
like i. . In addition, it would allow non-English languages not be
restricted to ASCII characters for names. Greek letters in mathematics
could be used as names making statements look a little more like
traditional mathematics. It would be simpler to allow all Unicode
characters be considered letters, but that might lend to other problems.
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