∅

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]

∅ U+2205, ∅ EMPTY SET ← ∄ [U+2204] Mathematical Operators ∆ → [U+2206]

⦰ U+29B0, ⦰ REVERSED EMPTY SET ← ⦯ [U+29AF] Miscellaneous Mathematical Symbols-B ⦱ → [U+29B1]

A slashed-zero variant is forced with ⟨︀⟩ in a supporting font.