20 Grains (Granum) (Gr. or Grs.) = 1 Scruple.
3 Scruples (Scrupulum) (Sc.) = 1 Drachm (60 Grs.)
8 Drachms (Drachma) (ʒ) = 1 Ounce.
12 Ounces (Uncia) (℥) = 1 Pound (℔)
In prescription writing the pound sign should not be used; always
express large quantities by ounces.