• 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 right-pointing tee to indicate direction.
• Extensible character.
• See Section 3.10.4.
• See also: \[RightBracketingBar] .