I recently found an open music theory book (I think I found it from the r/musictheory subreddit). I haven't read it yet but it talks about this.

https://viva.pressbooks.pub/openmusictheory/front-matter/int...

Under the Accessibility section:

> We use some less-standard terminology to help readers who use screen readers; in particular, we never use a capital/lowercase letter M to distinguish major and minor qualities, and instead use the abbreviations “ma” and “mi.” Hopefully this nomenclature will become more common over time.