五铢钱 Wuzhu Coin
秦灭六国后，废除各国旧币，将圆形方孔半两钱作为法定货币，中国古货币的形态从此固定下来，一直沿用到清末。汉武帝时，收回郡国铸币权，由中央统一铸造五铢钱。从此确定了由中央政府对钱币铸造、发行的统一管理。“铢” 是中国古代重量单位，一铢约合现代 0.65 克，“五铢” 即重量为 3.25 克左右，东汉所铸的钱，都是五铢钱。
After the Qin dynasty conquered the six warring states, it abolished the old currencies of various states and established the round coin with a square hole in the center, each weighing half a liang (banliang qian), as the legal tender. From then on, the form of ancient Chinese currency was fixed, continuing in use until the end of the Qing dynasty. During the reign of Emperor Wu of the Han dynasty, the central government centralized the right to mint coins, taking it away from regional states, and began to uniformly produce five zhu coins. This established the central government’s unified management over the minting and issuance of currency. “Zhu” was an ancient Chinese unit of weight, with one zhu equivalent to approximately 0.65 grams in modern measurement, so “five zhu” refers to a weight of about 3.25 grams. All coins minted during the Eastern Han dynasty were five zhu coins.