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| A slashed-zero variant isforced with ⟨︀⟩ in a supporting font. |
The set-theoretic meaning of this symbol was introduced by theBourbaki group in their treatiseÉléments de mathématique.André Weil has said in his autobiography that he based it on theNorwegian letterØ.[1]
∅
Unicode enables a variant that looks like a slashed zero,0︀, by following ∅ withVariation Selector 1 (U+FE00).[2]
From the empty set symbol.
∅
