Here's a CDN based system that can be used to embed math into web pages.
And here's a description of LaTeX.
I imagine that a BB Code would replace the LaTeX delimiter with [math][/math] or [latex][/latex] type codes.
Anyway, just putting it out there that there seems to be a lack of an add-on/BB Code of this type. Maybe someone looking to practice some coding might be interested in a project like this?