Some things just don't have abbreviations. This is one of them.
Hope this helps!
RE
RAF would be the abbreviation for the Royal Air Force.
RAF would be the abbreviation or acronym of Royal Air Force.
R.a.
HRH
RAAF
eggplant, elderberry
RAF for Royal Air Force
RSPCA
Royal Society for the Prevention of Cruelty to Animals
Royal Society for the Prevention of Cruelty to Animals
Fellow of the Royal College of Surgeons
FRS means Fellow of Royal Society.