In practical sense, the so-called "Chinese clothes" have the functions of preventing rape and discriminating counterfeiting. As an individual's arbitrary writing, the changed "Fu Zi" (some of which are not a kind of writing, but only used as personal special marks) is naturally more difficult to imitate, achieving the anti-counterfeiting effect, so this kind of Fu Zi has been used until the Ming and Qing Dynasties.

"Wu" is his own unique special symbol to prevent others from counterfeiting. This word can only be said to be like "Wu", including the word "king among people"

Zhao Gou's "king among men" is shaped like the word "martial arts", but its middle is folded in a downward long tail. The complete explanation of "Wu" is that the single liren on the left is pronounced as "person" alone, and the middle part on the right is bent horizontally. If you cut it straight and simplify it into a horizontal shape, you will form the word "Wang". The explanation of "zhong" is because the second and third horizontal paintings on the right are directly connected with the components on the left, and the middle "zhong" can be formed by simply penetrating the vertical shape in the middle of the king.

The explanation of the word "zhong" seems far-fetched, but the word "ren" of "under one person" is not satisfactory. The flower pawn itself does not need a complete interpretation. Its function is not only to reveal personal characteristics, but also to prevent forgery, similar to the current public and private seals, seals and riding seals. In the early days of the founding of the Southern Song Dynasty, after the restoration of the throne, there were espionage activities in the sphere of influence of the Jin State and the northern puppet regime, which disrupted the rule of the Southern Song Dynasty. At that time, it was necessary to use Hua 'an.