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