Money is an enlightenment book that the ancients used to read. Almost everyone can recite it without repeating every word. So its first word usually stands for one, the second word stands for two, and so on.
For example, at the beginning of Qian Zi Wen, it says: "Heaven and earth are mysterious and yellow, and the universe is vast", so it is recognized that heaven is one, earth is two, mystery is three, and yellow is four,,,, and that is what the movie "The First in Heaven" means. It is still often used in ancient books.
In addition, literati often use other favorite sentences to number them, such as "the mountain is high and the moon is small", which means the word "mountain" comes first, the word "high" comes second, and so on. The law of this symbol is known to ancient scholars, so you can tell it is a serial number at a glance.
More distant, there are years, too old. "Quinton, Chi Fenruo, She Tige,, Luo, Du Tang, Tan Qi,,, Dayuanxian" represents "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei and Shen"