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RightDoubleBracketingBar
\[RightDoubleBracketingBar]
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 The Mathematica Book: Section 3.10.4.
See also: \[RightBracketingBar] .
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