LeftUpDownVector 
LeftUpDownVector[x,y,…]
displays as .
Details

- LeftUpDownVector[x,y,…] has no built-in meaning.
is by default interpreted as LeftUpDownVector[x,y].
can be entered as \[LeftUpDownVector].
Examples
Basic Examples (1)
Wolfram Research (1996), LeftUpDownVector, Wolfram Language function, https://reference.wolfram.com/language/ref/LeftUpDownVector.html.
Text
Wolfram Research (1996), LeftUpDownVector, Wolfram Language function, https://reference.wolfram.com/language/ref/LeftUpDownVector.html.
CMS
Wolfram Language. 1996. "LeftUpDownVector." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/LeftUpDownVector.html.
APA
Wolfram Language. (1996). LeftUpDownVector. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/LeftUpDownVector.html