is an option for InputForm and related functions that specifies whether ` marks should be included in the printed forms of approximate numbers.


NumberMarks
is an option for InputForm and related functions that specifies whether ` marks should be included in the printed forms of approximate numbers.
Details

- The default setting for NumberMarks is given by the value of $NumberMarks.
- NumberMarks->True indicates that ` should be used in all approximate numbers, both machine‐precision and arbitrary‐precision ones.
- NumberMarks->Automatic indicates that ` should be used in arbitrary‐precision but not machine‐precision numbers.
- NumberMarks->False indicates that ` should never be used in outputting numbers.
- Number marks are used to indicate the type of numbers, and their precision or accuracy.
- The *^ form for scientific notation is always used in InputForm, and is independent of NumberMarks.
See Also
Tech Notes
Related Guides
History
Introduced in 1996 (3.0)
Text
Wolfram Research (1996), NumberMarks, Wolfram Language function, https://reference.wolfram.com/language/ref/NumberMarks.html.
CMS
Wolfram Language. 1996. "NumberMarks." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/NumberMarks.html.
APA
Wolfram Language. (1996). NumberMarks. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/NumberMarks.html
BibTeX
@misc{reference.wolfram_2025_numbermarks, author="Wolfram Research", title="{NumberMarks}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/NumberMarks.html}", note=[Accessed: 08-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_numbermarks, organization={Wolfram Research}, title={NumberMarks}, year={1996}, url={https://reference.wolfram.com/language/ref/NumberMarks.html}, note=[Accessed: 08-August-2025]}