This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Mathematica Character Name


  • Unicode: 22C3.
  • Alias: Esc un Esc.
  • Infix operator with built-in evaluation rules.
  • x  union y is by default interpreted as Union[x, y].
  • The character  union is sometimes called "cup".