Speaking about accessibility, who came up with that name "magic number"? It's already an overloaded term with multiple meanings and even has one negative one (for constants that has seemingly "magic" meaning or not a fully understood one).
Even something like "contrast ratio" would be immediate to come up with, and much better name as it actually says something on the tin.
> Hey Pete, what is the magic number for our color scheme in article body text?
Makes no sense... Replace "magic number" with "contrast ratio" and suddenly it does make sense.