This link should work - it is about the glossary of mathematical symbols:
https://en.wikipedia.org/wiki/Glossary_of_mathematical_symbols
Hope that was helpful . . .
This could be helpful too!
https://web.archive.org/web/20090323063515/http://mirrors.med.harvard.edu/ctan/info/symbols/comprehensive/
Hope that was helpful.
More LaTeX:
https://web.archive.org/web/20141105143723/http://www.artofproblemsolving.com/Wiki/index.php/LaTeX:Symbols
Simple Wikipedia - List of mathematical symbols:
https://simple.wikipedia.org/wiki/List_of_mathematical_symbols
This could be helpful . . . :
https://mathvault.ca/hub/higher-math/math-symbols/