ruler
The ruler is the traditional length unit of East Asia, that is, ten inches, initially based on the adult arm length as a measure. Originated in China Yin Dynasty, after the generation of different systems, spread to Japan, the Korean Peninsula, Vietnam and other places, in the local and their respective changes. Now unearthed in the Western Han Dynasty footsteps, there are 23.1 cm in length and 23.2 cm of the wrong gold bars. About the length of adult woman palm, about eight inches. [Women in the hands of eight inches that the hand, weeks also. - "Said the text"]. "Close" in the literature commonly used to metaphor close distance. ...