DoubleVerticalBar[x,y,…]
displays as x∥y∥….
    
   DoubleVerticalBar 
DoubleVerticalBar[x,y,…]
displays as x∥y∥….
Details
- DoubleVerticalBar[x,y,…] has no built-in meaning.
 - x∥y is by default interpreted as DoubleVerticalBar[x,y].
 - ∥ can be entered as \[DoubleVerticalBar] or 
␣||
. 
||
 is the alias for \[Or]. The alias for \[DoubleVerticalBar] has a space at the beginning. 
Examples
Basic Examples (1)
Tech Notes
History
Introduced in 1996 (3.0)
Text
Wolfram Research (1996), DoubleVerticalBar, Wolfram Language function, https://reference.wolfram.com/language/ref/DoubleVerticalBar.html.
CMS
Wolfram Language. 1996. "DoubleVerticalBar." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DoubleVerticalBar.html.
APA
Wolfram Language. (1996). DoubleVerticalBar. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DoubleVerticalBar.html
BibTeX
@misc{reference.wolfram_2025_doubleverticalbar, author="Wolfram Research", title="{DoubleVerticalBar}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/DoubleVerticalBar.html}", note=[Accessed: 03-November-2025]}
BibLaTeX
@online{reference.wolfram_2025_doubleverticalbar, organization={Wolfram Research}, title={DoubleVerticalBar}, year={1996}, url={https://reference.wolfram.com/language/ref/DoubleVerticalBar.html}, note=[Accessed: 03-November-2025]}