You may be looking for a list of LaTeX Math (and other) symbols, and the best place to look is

• symbols-a4.pdf, a pdf document containing many, many symbols, listed by type (binary relations, arrows, etc.) and package. This list is also available by ftp, and in letter (i.e. 8\frac{1}{2}" \times 11") format at
  • http://www.tex.ac.uk/tex-archive/info/symbols/comprehensive/

Another couple of helpful resources are

• mimetex tutorial – a tutorial accompanying mathTeX, a package that produces images representing math written with LaTeX. This can be done on-the-fly by installing the program as a cgi application on the server, or, if one's hosting provider won't allow that, composing locally, saving the images, and uploading them to the hosting provider's server (via ftp).
• Getting to Grips with Latex - Mathematics II

I hope that helps.

This is (just) a page to test the availability of some LaTeX math symbols I needed (or wanted) for re-copying my lecture notes using JSMath : there are many LaTeX math packages with additional symbols or aliases. (see above-mentioned resource).