The meanings of a, b, c and d

A, B, C and D are a sequence in ancient heavenly stems, which are used to express order and sequence. Where A stands for first, B stands for second, C stands for third and D stands for fourth. This sequence is usually used in the fields of numerology and geomantic omen to represent the order and change of time and space. The relevant knowledge is as follows:

1. Besides indicating the order, A, B, C and D are also used to name various things. For example, in the ancient imperial examinations in China, there were three classes of Jinshi in the examinations. There were three people in the first class, namely, the champion, the second class and the third class, while the second class and the third class were the Jinshi in other examinations. A here is used to indicate rank and order.

2. In addition, EPDM is also used to name various chemical elements. In the periodic table of elements, elements are arranged according to atomic number, in which the symbol of hydrogen is H, the symbol of helium is he, the symbol of carbon is C, the symbol of nitrogen is N, and so on. The names of these elements are all composed of a letter and a number, which are arranged in the order of A, B, C and D. ..

Related knowledge of ancient heavenly stems

1. Ancient Tiangan is a counting and naming method in ancient China, and it is an important part of China traditional culture. Tiangan consists of ten words, namely, A, B, C, D, E, Ji, G, Xin, Man and Ghost.

2. There are many opinions about the definition and origin of heavenly stems, one of which holds that heavenly stems are produced by the surplus and contraction of the sun and the lunar calendar. According to this statement, A stands for the sun, B stands for the moon, C stands for Venus, D stands for Mars, E stands for Jupiter and Saturn, G stands for Venus, Xin stands for Mars, Ren stands for Mercury and decyl stands for Venus.

3. Another way of saying this is that the heavenly stems are visualized with ten branches, in which A stands for head, B stands for neck, C stands for shoulder, D stands for chest, E stands for abdomen, self stands for back, G stands for waist, Xin stands for hand, nonyl stands for foot and decyl stands for mouth.

4. Tiangan is widely used in China traditional culture. It is not only used for naming and counting, but also for prediction and divination. In numerology, heavenly stems are used to express a person's fate and personality characteristics. In geomantic omen, heavenly stems are used to indicate directions and five elements. In addition, Tiangan is also used in medicine, music, art and other fields.