Dram (unit)

The dram (alternative British spelling drachm; apothecary symbol ʒ or ℨ; abbreviated dr) was originally both a coin and a weight in ancient Greece. It refers to a unit of mass in the avoirdupois system, and both a unit of mass and a unit of volume in the apothecaries' system. The unit of volume is more correctly called a fluid dram, fluid drachm, fluidram or fluidrachm (abbreviated fl dr, ƒ 3, or fʒ).