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based on an earlier version of the Wolfram Language.
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Mathematica Character Name

\[Backslash]

  • Unicode: 2216.
  • Alias: Esc \ Esc.
  • Infix operator.
  • x \ y is by default interpreted as Backslash[x, y].
  • Used in mathematics for set difference.
  • Also used to separate arguments of elliptic functions.
  • Sometimes used to indicate x divides y.