What ancient coins are there?

Seashells, jade shells, bone shells, five baht, gold, silver, copper shells, tortoise shells, knife coins, copper coins ... China coins have a circulation history of thousands of years, and the number and types are considerable; Similarly, it is not easy to classify coins that span thousands of years in detail. We can only make a rough classification from several aspects. In terms of materials, China's currencies include gold, silver, copper, iron, tin and lead. Of course, it should also include seashells, stone shells, bone shells, pearls, jade, turtle shells and so on. Used in the pre-Qin period, the earliest paper money "Jiaozi" in the Song Dynasty. From the shape point of view, there is a knife shape, which mainly refers to Qi and Yan knife shapes; Agricultural shovel shape, mainly refers to weekly and three gold money; Wall ring, mainly refers to the money of Qin dynasty; Shell-shaped, refers to Chu's ant nose money; Version refers to Chu's Love; Cake, refers to the "Ai Chen" of Chu. From the Qin Dynasty to the late Qing Dynasty, the coins used in these two years were basically round holes. By the end of the Qing Dynasty, machine-made copper coins appeared again, and the square hole in the middle of the round coins disappeared. In Qian Wen's view, ancient Chinese coins include the characters of various ethnic groups in China, such as Han, Liao, Xixia, Manchu, Mongolian, Turkic, Uighur, Tubo and Nuzhen. Among them, the Chinese characters on coins in past dynasties have calligraphy styles such as authentic, cursive, running, official script and seal script, and there are also many calligraphy styles written by famous calligraphers, such as the eight-part script (Kaiyuan), Song Huizong's thin gold calligraphy (Daguan, Chongning) and the party's imperial seal (Taihe Chongbao). From the use point of view, coins often have other uses besides trade, mainly winning money, giving money, washing children's money, throwing money, palace money, supporting money and so on. Fear of winning money means avoiding evil spirits and seeking wealth, which is equivalent to an amulet, also called winning money. For wearing, there are various patterns, auspicious words, names of people and officials. Children's money laundering is a gift to congratulate others on giving birth to children. The money was a tip distributed at the wedding. Palace money is a special currency used for decoration and reward during festivals in the palace. Support money refers to coins used as offerings in temples, usually hidden in the belly of Buddha statues or hung next to shrines.