Copper coin, ancient copper coin, refers to all kinds of square hole coins after Qin and Han dynasties, and the casting period of square hole coins continued until the late Qing Dynasty and the early Republic of China.

During the Spring and Autumn Period and the Warring States Period, with the development of commodity economy, the metal weighing currency that needs to be divided and identified in circulation gradually became unsuitable and was replaced by metal coins. Most ancient coins in China were cast in the form of copper alloy, and square hole coins (copper coins) were the most common ancient coins.

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It is convenient and safe to carry copper coins around your waist. This is the origin of the word "travel expenses".

"Travel expenses" refers to the travel expenses mentioned today. However, why are the travel expenses "dished" and "tangled"? Coiling and winding are synonyms. Of course, money has nothing to do with today's winding, but there is some inevitable connection in ancient times!

Ancient money was a metal coin with a hole in the middle. It is often used to hang a thousand coins in a string. The rope that wears money is called "wearing", so a thousand dollars is also called hanging money or consistent money. There is a play called Fifteen Biographies, which is a case involving fifteen strings of money.

In ancient times, don't say that there were no traveler's checks and credit cards, and even paper money came later. Therefore, when people go out on business to visit relatives, they can only carry a heavy string of copper coins. Wrapping copper coins around your waist is easy to carry and inspect everywhere, so the ancients called it "winding", "winding" and "travelling expenses".

The above content comes from Baidu Encyclopedia-Copper Coin