Full Name: Reaumur
Scale Factor: 3
The degree Reaumur (°Ré, °Re, °R) is an obsolete unit of temperature. Named after René Antoine de Reaumur Ferchault who proposed it in 1731 as a unit.
A value of 0° corresponds to Réaumur freezing point of water and 80° Reaumur the boiling point of water. Thus, unlike the Celsius or Kelvin scales, graduation from this interval corresponds to 80° Reaumur rule. It resembles the Celsius scale in that 0° Celsius equals 0° Réaumur.
This temperature system is sometimes used to measure the temperature of the syrup and candies.