This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


  • Unicode: 2202.
  • Alias: Esc pd Esc.
  • Prefix operator with built-in evaluation rules.
  • is by default interpreted as D.
  • is used in mathematics to indicate boundary.
  • You can use \[InvisibleComma] in the subscript to to give several variables without having them separated by visible commas.