RN

[[t]ɑ͟ːr e̱n[/t]]

1) RN is a written abbreviation for Royal Navy, the navy of the United Kingdom. It is written after someone's name to show that they are an officer of the Royal Navy. [BRIT]

...RN Museum, Portsmouth.

...Commander Richard Aylard RN.

2) RN is an abbreviation for registered nurse. [AM]

...a pediatric nurse, Kathleen McAdam RN.