A well-known nursery rhyme, "Hook and hang yourself, never change for a hundred years", is also very vivid. When we were young, we often hooked our fingers and promised each other in this way. What a ceremonial move.

Therefore, hanging with a hook has also been given the meaning that things are agreed and will never change.

Data reference:

In fact, "hanging" does not mean "hanging" in our current "hanging suicide". But in ancient times, all the currencies in circulation were copper coins. The face value of copper coins is very small, so if a large number of copper coins are used, the ancients often string 1000 copper coins into a string, which was called "hanging" in ancient times, and "hanging" means hanging this "hanging" copper coin on the wall, indicating that this matter has been confirmed and cannot be changed. So what we are talking about now is to imitate the ancient steps of "hanging" copper coins and then hang them on the wall.

Because many things in ancient times were not as important as money, money was regarded as an important standard of agreement. It can be seen that saying this sentence in the agreement also means that you can't go back on your word. It can be seen that our ancestors really spoke with wisdom. There are many proverbs that have been passed down to this day, and it makes sense to think about them carefully.