\[LeftDoubleBracketingBar]

• Unicode: F605.

• Alias: Esc l|| Esc.

• 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 left-pointing tee to indicate direction.

• Extensible character.