• Unicode: F606.
  • Alias: r||.
  • Matchfix operator.
  • x is by default interpreted as DoubleBracketingBar[x].
  • Used in mathematics to indicate taking a norm.
  • Sometimes used for determinant.
  • Sometimes used to indicate a matrix.
  • Not the same as \[DoubleVerticalBar].
  • Drawn in monospaced fonts with a small rightpointing tee to indicate direction.
  • Extensible character.
Introduced in 1996