RN is an abbreviation for registered nurse. a pediatric nurse, Kathleen McAdam RN. The symbol for the element radon
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. RN Museum, Portsmouth. Commander Richard Aylard RN
a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
On an apparel label, the "Registered Identification Number" (despite being three words it's not a "RIN") A code number assigned to a apparel importer or manufacturer by the Federal Trade Commission (FTC) The FTC Web site provides a cross-reference from RN to name and address Also see "WPL" for wool products