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: F520.
  • Alias: Esc sq Esc.
  • Prefix operator.
  •  x is by default interpreted as Square[x].
  • Used in mathematical physics to denote the d'Alembertian operator.
  • Sometimes used in number theory to indicate a quadratic residue.