LetterQ
Details

- LetterQ[string] by default gives False if string contains any space or punctuation characters.
- LetterQ handles both ordinary and special characters.
- LetterQ treats as letters all special characters explicitly listed as letters in the table in "Named Characters".
- In general, LetterQ treats as letters all characters that appear as ordinary text in any language.
- LetterQ treats as letters such special characters as α, , ℒ, and æ.
- LetterQ does not treat as letters ∅ (\[EmptySet]), ℏ (\[HBar]), Å (\[Angstrom]), or ∑ (\[Sum]).
Examples
open all close allScope (6)
Generalizations & Extensions (1)
Possible Issues (1)
Tech Notes
Related Guides
History
Introduced in 1991 (2.0) | Updated in 1996 (3.0)
Text
Wolfram Research (1991), LetterQ, Wolfram Language function, https://reference.wolfram.com/language/ref/LetterQ.html (updated 1996).
CMS
Wolfram Language. 1991. "LetterQ." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 1996. https://reference.wolfram.com/language/ref/LetterQ.html.
APA
Wolfram Language. (1991). LetterQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/LetterQ.html
BibTeX
@misc{reference.wolfram_2025_letterq, author="Wolfram Research", title="{LetterQ}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/LetterQ.html}", note=[Accessed: 11-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_letterq, organization={Wolfram Research}, title={LetterQ}, year={1996}, url={https://reference.wolfram.com/language/ref/LetterQ.html}, note=[Accessed: 11-August-2025]}