The ability to add letters after your name as a result of academic qualifications can lead to some strange things. Peter Coles notes that recent changes at Sussex University, renaming their doctoral degree as a PdD instead of a DPhil, mean that someone with an MA and a doctorate from there can no longer write MADPhil after their name. And those who are Fellows of the Royal Astronomical Society (FRAS) can get a rapid promotion by choosing the right mix of font sizes so they can become FRS by writing the A very small.
This all reminds me that Imperial still, as far as I’m aware, continue the tradition of adding their own unique qualifications to standards degrees despite leaving the University of London and awarding its own degrees. Those graduating with a first degree in physics, for example, still become Associates of the Royal College of Science, and those getting a higher degree, gain the Diploma of Imperial College.
I did both, so can thus claim to have both an ARCS and a DIC.