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: 039E.
  • Aliases: Esc X Esc, Esc Xi Esc.
  • Greek letter.
  • Not commonly used.
  • Used for grand canonical partition function, cascade hyperon and regular language complexity.