Myriagram
The myriagram is a former French and metric unit of mass equal to 10,000 grams. Although never as widely used as the kilogram, the myriagram was employed during the 19th century as a replacement for the earlier American customary system quarter, which was equal to.
In 1975, the United States, having previously authorized use of the myriagram in 1866, declared the term no longer acceptable.
