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∅ EMPTY SET (U+2205)
The key is to find the one in the “mathematical operators” section, not some accented O character.
Oh, cool, I was accidentally correct! I think I pasted my ∅ off a swedish page.
No, not quite correct. The character pasted off the Swedish page was Ø LATIN CAPITAL LETTER O WITH STROKE (U+00D8).
It looks almost identical to the to the mathematical symbol for an empty set (at least in the font I’m using right now), but it doesn’t mean anything even slightly similar and would be rendered entirely differently by, for example, a screen reader reading the text aloud.
Oh, yes, I can see the difference now. Thanks for filling me. My jokes about sets will now be 11% funnier.