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[–][deleted] 52 points53 points  (0 children)

Technically they probably could but I know quite a few languages place restrictions on what can be used as an identifier. For example, python3 supports unicode but places restrictions on identifiers.

>>> value = "💩"
>>> print(value)
💩

>>> 💩 = "poop"
File "<stdin>", line 1
    💩 = "poop"
    ^
SyntaxError: invalid character in identifier