one-thousandth; 0.03 mm; 0.01 percent; 3.75 mg
Traditional Japanese unit meaning one-thousandth of a base unit. Used in specific contexts: length (0.03 mm, 1/1000 of a 寸), percentage (0.01%, 1/1000 of a 割), and weight (3.75 mg, 1/1000 of a 匁). Rare in modern daily life, but may appear in historical or technical texts.
In old Japan, 毛 was used as a unit of length.
old monetary unit (0.0001 yen)
Obsolete currency unit equal to one ten-thousandth of a yen. Used before the modern yen system was fully established. Only encountered in historical financial contexts.
この精密部品の公差は数毛単位だ。
The tolerance of this precision part is on the order of a few 毛.
In Edo-period ledgers, the currency unit 毛 is sometimes recorded.