LeftBracketingBar
 Usage
 \[LeftBracketingBar]
Notes
• Alias:  l|. • Matchfix operator. •  x  is by default interpreted as BracketingBar[x]. • Used in mathematics to indicate absolute value (Abs), determinant (Det), and other notions of evaluating size or magnitude. • Not the same as \[VerticalBar] . • Drawn in monospaced fonts with a small left-pointing tee to indicate direction. • Extensible character. • See Section 3.10.1 and Section 3.10.4. • See also: \[LeftDoubleBracketingBar] , \[LeftTee] .
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