Question: I recently read the symbol $\therefore$ in a couple of posts. Unfortunately i can't find the posts anymore. Does this have any special mathematical meaning?
I think you are referring to $\therefore$
As the latex command implies (it is \therefore), it means "therefore".
The notation $\therefore$ (written as \therefore) is shorthand for the word therefore. Since the symbol connects cause and effect, the symbol is pretty common and thus has a common abbreviation. This link has a list of more logic symbols, such as $\forall$ (for all). Also, the upside-down version of the symbol is used to mean "because"