If you're trying to learn how to typeset formulae with LaTeX, detexify is great - it lets you draw a symbol, and tries to identify it: http://detexify.kirelabs.

If you're trying to learn how to typeset formulae with LaTeX, detexify is great - it lets you draw a symbol, and tries to identify it: http://detexify.kirelabs.org/classify.html http://detexify.kirelabs.org/classify.html