The noon of noon is written as follows: left, horizontal, horizontal, vertical.

Wu, a first-level Chinese character, pronounced as wǔ, was first seen in oracle bone inscriptions. Its original meaning is Chongchu, which is extended to refer to conflict (that is, the so-called "啎ye" in "Shuowen Jiezi"), and is borrowed as " "Five" refers to the vertical and horizontal intersection, and is also used as the seventh place of the twelve earthly branches. It can also represent the "horse" in the twelve zodiac signs.

The origin of Chinese characters:

Wu, a pictographic character. In terms of glyph shape, the character "Wu" in Oracle Bone Inscriptions looks like a wooden pestle used to pound rice, which is the first character of "pestle". The character "Wu" in bronze inscriptions was modified based on its oracle bone character shape, while the character "Wu" in Xiaozhuan script was standardized, and after using the official script shape, it was written as "Wu" in regular script.

In terms of literal meaning, the original meaning of the word "Wu" is "Chongchu", which is extended to mean "contradiction, disobedience". It is also used as "five" to mean "intersection", and also as "twelve earthly branches". "The seventh position, combined with the heavenly stems to mark the year, month, day, and hour." It can also represent "the 'horse' in the twelve zodiac signs" and so on.

Explanation from ancient books:

Shuowen interpretation:

Wu means 啎. In May, Yin Qi goes against Yang at noon and emerges from the ground. Yuya agrees. All the attributes of Wu are from Wu. Doubtful.

Kangxi Dictionary:

"Tang Yun", "Ji Yun", "Yun Hui", "Zheng Yun" are all suspected to be ancient and have five tones. "Shuowen": 牾也. In May, the yin energy goes against the yang at noon and emerges from the ground. Xu said: In May, the yang pole is the yin. Those who are dead are those who are rushing towards them.

Also known as Chen. "Erya·Shitian": Tai Sui is called Dun Zang at noon. "Huainanzi Shi Ze Xun": The fifth month of Dou refers to noon.

Also "Guangyun": Jiaoye. "Yunhui": One vertical and one horizontal are called Pangwu, which is also said to be cross-horizontal. "Rituals·Feeding Food for Special Animals": The heart and tongue are all removed, and they are cut off at the end of the day. Note: It is also cut vertically and horizontally. "Etiquette·Nei Principles": Male roles and female restraints. Note: Wuda means Ji. Shu: Measure the ruler at noon and ask the girl to cut her hair and leave it on the top of her head, vertically and horizontally, so that they are connected. "The Biography of Huo Guang of the Former Han Dynasty": The messenger was at noon. Note: Pangwu means distribution.

It is also against the law. See "The Biography of Liu Xiang of the Former Han Dynasty".

Also in "The Biography of Liu Xiang of the Former Han Dynasty": Floods, droughts, hunger and locusts arise together at noon. Note: It’s still a mess.

There is also a Cheng-style poem: My beloved is soaked in papaya water to cover up the red cheeks and midday marks.

Also "Yunhui": Horse belongs to Wu. The surname of Jin was Sima, so the official name of Sima was changed to Dianwu.