> since its an acronym you should always format it as MAC That's the American convention, but it can vary elsewhere. If you look at BBC articles, you'll find t

> since its an acronym you should always format it as MAC That's the American convention, but it can vary elsewhere. If you look at BBC articles, you'll find that initialisms (like HIV) will be capitalized, but acronyms (like Aids) will only have an initial capital letter. Since "Mac" will be pronounced rather than saying "M-A-C", the style in a lot of the world would be to only capitalize the "M". Wikipedia's English language style guide specifically notes that it doesn't follow the convention of distinguishing between acronyms and initialisms: https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Capital_letters#Acronyms https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Capi.... There's more information in the article about acronyms: https://en.wikipedia.org/wiki/Acronym#Case https://en.wikipedia.org/wiki/Acronym#Case "Some publications choose to capitalize only the first letter of acronyms, reserving all-caps styling for initialisms, writing the pronounced acronyms "Nato" and "Aids" in mixed case, but the initialisms "USA" and "FBI" in all caps."