NotDoubleVerticalBar
 Usage
 \[NotDoubleVerticalBar]
Notes
• Alias:  !||. • Infix operator. • x  y is by default interpreted as NotDoubleVerticalBar[x, y]. • Used in geometry to mean "not parallel to". • See Section 3.10.4. • See also: \[DoubleVerticalBar] , \[NotVerticalBar] , \[UpTee] .
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