UpArrowDownArrow 
UpArrowDownArrow[x,y,…]
displays as 
.
Details
- UpArrowDownArrow[x,y,…] has no built-in meaning.
is by default interpreted as UpArrowDownArrow[x,y].
can be entered as \[UpArrowDownArrow].
Introduced in 2007
(6.0)
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