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Dram (unit)
The dram (alternative British spelling drachm; apothecary symbol ʒ; abbreviated dr)〔 Earlier version first published in ''New English Dictionary'', 1897.〕〔National Institute of Standards and Technology (October 2011). Butcher, Tina; Cook, Steve; Crown, Linda et al. eds. ("Appendix C – General Tables of Units of Measurement" ) (PDF). (''Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices'' ). NIST Handbook. 44 (2012 ed.). Washington, D.C.: U.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology. ISSN (0271-4027 ). OCLC . Retrieved 1 July 2012.〕 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).〔〔〔
== Ancient unit of mass ==
* The Attic Greek drachma was a weight of 6 obols, Greek mina, or about 4.37 grams.
* The Roman drachma was a weight of Roman pounds, or about 3.41 grams.
The Ottoman dirhem was based on the Sassanian drachm, which was itself based on the Roman dram/drachm.
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