0 a registered nurse ; also used after the name of a registered nurse -- 注册护士(可用于姓名后)
1 abbreviation for Royal Navy: used especially after the names of officers in the British navy -- 英国皇家海军(尤用于海军军官姓名后,Royal Navy的缩写)
Captain H. Doughty, RN 英国皇家海军上校 H.道蒂
2 abbreviation for registered nurse -- 注册护士(registered nurse的缩写)