Wiktionary
mathematical markup language
n. (context mathematics computing English) A method of representing mathematical symbols and formulae using XML
Wikipedia
Mathematical markup language
A mathematical markup language is a computer notation for representing mathematical formulae, based on mathematical notation. Specialized markup languages are necessary because computers normally deal with linear text and more limited character sets (although increasing support for Unicode is obsoleting very simple uses). A formally standardized syntax also allows a computer to interpret otherwise ambiguous content, for rendering or even evaluating. For computer-interpretable syntaxes, the most popular are TeX/ LaTeX and MathML (Mathematical Markup Language).