Tanhaku (also called shohaku) is a business custom which had been conducted in East Asia before the early modern times; with this custom, a bundle of copper coins consisting of a certain number of coins less than 100 is treated as equal value to 100 copper coins.
短陌（たんはく、省陌（しょうはく）とも）は、近代以前の東アジア地域で行われてきた商慣習で、100枚以下の一定枚数によって構成された銅銭の束を銅銭100枚と同一の価値として扱う事。