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

\[NotElement]

  • Unicode: 2209.
  • Aliases: Esc !el Esc, Esc !elem Esc.
  • Infix set relation operator with built-in evaluation rules.
  • x ∉ y is by default interpreted as NotElement[x, y].