Rhes
(Units Package Symbol) Rhes is a unit of viscosity.
Rood
(Units Package Symbol) Rood is a unit of area.
Rope
(Units Package Symbol) Rope is a unit of length.
Rutherford is a unit of radioactivity.
Seam
(Units Package Symbol) Seam is a unit of volume.
Shekel is a unit of weight.
ShortTon is a unit of weight.
Shot
(Units Package Symbol) Shot is a unit of volume.
SiderealYear is a unit of time.
Skein
(Units Package Symbol) Skein is a unit of length.