This word itself is a typo, it has been interpreted by the emperors of all generations, changed back and forth, after the founding of New China, the Forbidden City became a museum, this typo has also become the bearer of history. People who have been to the Forbidden City know that the door characters on many plaques in the Forbidden City do not have the small tick in the lower right corner, such as the Taihe Gate, the Noon Gate and so on. Nowadays, primary school students know that this is a typo, and the ancient emperor's cultural level is not low, and he must also know it, but why has no one corrected it after hundreds of years?
It is said that the word "door" in the imperial palace without hooks first originated from a fire. At that time, Zhao's Southern Song Dynasty was built in Lin'an. In the beginning, all the door letters of the palace were hooked, which was normal, just like the capital door letters we have today. But, suddenly, there was a fire in the palace.
At that time, the film police in charge of public security had an unshirkable responsibility. However, he calmly told Zhao Zhao that this was within the Imperial City, who dared to set fire so boldly. In fact, it was the heavenly thunder that hooked the earth fire, causing this evil fire. Asked how he hooked the fire in the ground, he said that it was precisely because of the "hook" under the word "door", ah, is this not the same as hooking the fire into the house? Zhao Shuo said I believed in your evil! However, as a feudal society, of course, it is afraid of the gods, so Zhao Zhuo ordered that the plaques and door characters in the palace should not be hooked.
In the Ming Dynasty, Zhu Yuanzhang built the capital Nanjing, and the door character was hooked again, but this time there was no fire, but Zhu Yuanzhang looked awkward. He said that with this point under this door, it was easy to block the way of speech, and it should really be removed, so the door in the palace was no longer hooked.
During the Qing Dynasty, those emperors were not very sensitive to Chinese characters, because they were either busy with war or busy with government affairs, and only the Qianlong Emperor was blindly pondering all day. He looked at this door word how to see how unpleasant, or how to say that people should be arrogant and the ancestors were afraid, the hook on this door was added when the Manchu Qing entered the customs. Qianlong said that this hook is not auspicious, and if I catch the dragon scale hook on my body, it will not be good. Thus, the poor word "door" was changed again.