is a special symbol returned by certain functions when they cannot do what they were asked to do.


$Failed
is a special symbol returned by certain functions when they cannot do what they were asked to do.
Examples
Basic Examples (1)
Opening a non-existing file is an operation that returns $Failed:

See Also
Failure Missing $Aborted FailureQ TerminatedEvaluation
Function Repository: OnFailure DeleteFailures
Tech Notes
Related Guides
History
Introduced in 1991 (2.0)
Text
Wolfram Research (1991), $Failed, Wolfram Language function, https://reference.wolfram.com/language/ref/$Failed.html.
CMS
Wolfram Language. 1991. "$Failed." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$Failed.html.
APA
Wolfram Language. (1991). $Failed. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$Failed.html
BibTeX
@misc{reference.wolfram_2025_$failed, author="Wolfram Research", title="{$Failed}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/$Failed.html}", note=[Accessed: 07-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_$failed, organization={Wolfram Research}, title={$Failed}, year={1991}, url={https://reference.wolfram.com/language/ref/$Failed.html}, note=[Accessed: 07-August-2025]}