This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)
MATHEMATICA CHARACTER NAME

\[DoubleLeftRightArrow]

  • Unicode: 21D4.
  • Alias: Esc <=> Esc.
  • Infix arrow operator.
  • Used in mathematics to indicate logical equivalence.
  • Extensible character.