MathML (Mathematical Markup Language) is an international open standard for encoding math content. This 2021 article from University of Washington’s DO-IT (Disabilities, Opportunities, Internetworking, and Technology) Center gives an overview of MathML’s accessibility benefits and links to additional MathML tools and resources.
https://doit.uw.edu/knowledge-base/what-is-mathml/
Mathspeak is a verbal system for orally communicating information about math. The system was created by Abraham Nemeth, a blind scientist and mathematician known for creating Nemeth Braille, a version of Braille designed to communication scientific and mathematical information.