1. (medicine) Abbreviation of Rhesus factor#English|Rhesus factor.



  1. Initialism of relative humidity
  2. (music, knitting) Initialism of right hand
    • 2012, Stefanie Japel, Mom and Me Knits (page 13)
      Work wraps together with wrapped sts as you come to them, as follows: Insert RH ndl into wrap at base of wrapped st from beneath, then bring RH ndl up and into st on LH ndl, ready to work the st […]
  3. Initialism of review#English|review hearing#English|hearing.
  4. (US, army, aviation) prefix code for reconnaissance helicopter designations

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