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From Wiktionary, the free dictionary

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See also: ∅-, -∅, Ø [U+00D8 LATIN CAPITAL LETTER O WITH STROKE], [U+2300 DIAMETER SIGN], and ø [U+00F8 LATIN SMALL LETTER O WITH STROKE]
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U+2205, ∅
EMPTY SET

[U+2204]
Mathematical Operators
[U+2206]
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U+29B0, ⦰
REVERSED EMPTY SET

[U+29AF]
Miscellaneous Mathematical Symbols-B
[U+29B1]
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A slashed-zero variant is forced with︀⟩ in a supporting font.
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