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Seems like Wikipedia has the answer: > When writing in languages such as Danish and Norwegian, where the empty set character may be confused with the alphabeti
by leipert 5y ago
Seems like Wikipedia has the answer:
> When writing in languages such as Danish and Norwegian, where the empty set character may be confused with the alphabetic letter Ø (as when using the symbol in linguistics), the Unicode character U+29B0 REVERSED EMPTY SET ⦰ may be used instead