RJ
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RJ or Rj may stand for:
- Registered jack
- Regional Jet, usually pertaining to aircraft manufactured by Bombardier Aerospace (CRJ), EMBRAER (ERJ), or BAE Systems Avro division (ARJ or RJ)
- the IATA code for Royal Jordanian
- Rim Job
- Reynolds American Inc., formerly RJ Reynolds
- RJ-11, RJ-25, RJ-45 or RJ-61 twisted-pair cables
- RJ Helton of American Idol