1, a pronunciation: yο/yāo (dialect), the capital of "one". Often used for checks, banknotes, etc. To avoid errors or modifications.

2.Er is a Chinese character, pronounced as èr, which means vice; It is also the capital form of "two", which is used for counting and bookkeeping; Also refers to defection and betrayal.

3,3, Pinyin, sā n. The capitalized form of "three" is generally used for monetary accounting, such as 300 yuan.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1000 "corresponds to capital: 1, 2, 3, 4, 5.

Extended data:

In the early years of the Ming Dynasty, a "major corruption case in Guo Huan" involving 12 senior officials and six assistant ministers used blank account books to make false accounts and embezzled money and grain by tampering with figures, with a total amount of more than 24 million stone (tons), almost equivalent to the total amount of autumn grain requisitioned in China at that time.

Zhu Yuanzhang was furious and ordered tens of thousands of accomplices, including Guo Huan, to be beheaded. At the same time, he made strict laws to punish economic crimes, and took technical precautions in financial management-changing the numbers in Chinese characters into hard-to-change capital letters, which was called the first time in China history.

Baidu Encyclopedia-Capital Numbers