RN
RN or Rn may stand for:
- rn (newsreader), a Usenet news client
- RN the code for County Roscommon, Ireland
- RN, the published memoirs of American President Richard Nixon
- Air Horizons's IATA code
- Fuerzas Armadas de la Resistencia Nacional, political party of El Salvador
- Province of Rimini's ISO 3166-2:IT code
- Radio National, an Australia-wide radio network broadcast by the Australian Broadcasting Corporation
- Radon (symbol Rn), a chemical element
- Regia Nave (Italian, meaning "Royal Ship"), a ship belonging to the Regia Marina
- Registered Identification Number, a number issued by the Federal Trade Commission, used on clothing tags and labels
- Registered nurse
- Renovación Nacional or National Renewal (Chile), a Chilean political party
- Resistencia Nacional of El Salvador
- Rio Grande do Norte, ISO 3166-2:BR code of the Brazilian state
- Round nose, a type of bullet
- Royal Navy of the United Kingdom
- Abbreviation for "right now".
See also
- Euclidean space with n dimensions, denoted by
or 
- Newline, represented as \r\n in certain operating systems
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