This much-used symbol has many meanings in medicine. They include: > >Respiration: a nurse's note of 'R20' is shorthand for 20 respirations (breaths) per minute. >Right: A doctor's note of a burn on the 'R digit 5' places the burn on the right little finger or toe. >Roentgen, an international unit of X-radiation or gamma-radiation. >In chemistry, a radical. >On a prescription, R (or Rx), recipe, which is Latin for 'to take'.