The world loves acronyms – abbreviations from the initial letter or sometimes syllables in phrase or a word. How much easier to text three letters than spell out three words? But will the reader know what MBS stands for? Melbourne Business School, Mind Body Spirit? It depends on the context, of course.
In this case, it is neither. MBS is the nickname of the Saudi Crown Prince, Mohammad bin Salman. I prefer MbS, following the use of upper and lower case in the spelt-out name (‘bin’ meaning ‘son of’) but the Style Manual says initialisms, which are not pronounced as a word as are acronyms (for example, OPEC*), should be all capitals. That said, I don’t think they had Arabic names in mind when they made this ruling.
So what does The Crown Prince stand for? To read more on this go to Peter Rodgers’ blog post Mohammad bin Salman – Saudi Arabia’s reformer or wrecker? in Pearls and Irritations.
*Organization of the Petroleum Exporting Countries (note the ‘z’ in organisation: in proper nouns following the preferred spelling of the entity or person)