RH

1. Acronym for right hand, as in RH drive. For all vehicles, left and right are from the perspective of sitting in the forward-facing Driver's seat.
2. Acronym for Relative humidity.

RHC

Acronym for Reactive hydrocarbons

RHD

Acronym for right-hand drive.

Rheostat

1. A resistor with variable resistance, e.g., the switch that dims the dash lights.
2. A variable resistor used to control blower speeds.

Rhodium

A silver-white noble metal in the platinum family; atomic number 45, atomic weight 102.905; used in thermocouples and, together with other platinum metals, as a catalyst in catalytic converters.

Rhr

Acronym for Rear head restraints.

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