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BUILT-IN MATHEMATICA SYMBOL
DoubleBracketingBar 
DoubleBracketingBar[x, y, ...]
displays as 
.
Details
- DoubleBracketingBar[x, y, ...] has no built-in meaning.
is by default interpreted as DoubleBracketingBar[x, y].
can be entered as \[LeftDoubleBracketingBar] or Escl||Esc.
can be entered as \[RightDoubleBracketingBar] or Escr||Esc.
New in 6
