The dram (alternative British spelling drachm; apothecary symbol ʒ or ℨ; abbreviated dr)[1][2]: C-6–C-7 [3] is a unit of mass in the avoirdupois system, and both a unit of mass and a unit of volume in the apothecaries' system.[2] It was originally both a coin and a weight in ancient Greece.[4] The unit of volume is more correctly called a fluid dram, fluid drachm, fluidram or fluidrachm (abbreviated fl dr, ƒ 3, or fʒ).[1][2]: C-17 [3][5][6][7]