Advanced sign / screen / typewriter block
TEX also known as LaTeX is a formatting language for math https://en.wikipedia.org/wiki/TeX
Input could just be a list of files brought in, or just a simple GUI to enter a block of text and then display in game.
Possible future addons to mod could be
- a very small fraction of what you can do with HTML, CSS
- superior version is LaTeX https://en.wikipedia.org/wiki/LaTeX