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They say that to use it for a good luck symbol, the horseshoe must be held with the round part down and the ends up, "otherwise the luck falls out". - read more

Horseshoe (⊃, \supset in TeX) is a symbol used to represent: Material conditional in propositional logic Superset in set theory It was used by Russell and Whitehead in Principia Mathematica. In Unicode the symbol is encoded U+2283 ⊃ horseshoe (HTML: ⊃ ⊃). See also List of ... - read more

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