Mina (unit)
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The mina (or also: mine) is an ancient Greek unit of weight defined as being 50 shekels.
The mina, like the shekel, was also a unit of currency. In ancient Greece it was equal to 100 drachmae.
In ancient Sumerian times, a m'na was a unit of weight: 1/60 talents and also 60 shekels.
Since the Akkadian period, 2 m'na was equal to 1 sila of water (cf. clepsydra, water clock).
Note, that the word "mine", in the sense of land mine came from the form of this ancient weight stone.