This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Mathematica Character Name


  • Unicode: 2261.
  • Alias: Esc SameQ Esc.
  • Infix similarity operator.
  • x ≡ y is by default interpreted as Congruent[x, y].
  • Used in mathematics for many notions of equivalence and equality.