The pentagram is a figure surrounded by 10 sides, with * * 5 angles, and the sum of the internal angles is 180 degrees, which is radioactive. It is precisely because of this shape of the five-pointed star that it gives people an authoritative, just and fair impression. The wonder of the five-pointed star lies in mathematics. Everyone knows the famous golden section, and its value is (√5- 1)÷2, which is about 0.6 18. Divide a line segment into two parts with different lengths, and the ratio of the short part to the long part is equal to the ratio of the long part to the original line segment, which is the golden section. And this famous value is hidden in the pentagram. This is a pentagonal amulet in witchcraft, the earliest symbol in the world, used before 4000 BC. Symbols have different meanings in different environments. The Pentagon is mainly a pagan symbol, which is a symbol of nature worship before Christianity came into being. The ancients believed that the world consisted of two parts-half men and half women. This pentagon represents half of women-a religious historian calls it a "sacred woman" or a "sacred goddess". The most specific explanation is that the five-pointed star symbolizes Venus, representing women and beautiful goddesses. American horror movies clearly show that the five-pointed star is also related to demons, which is actually incorrect. Although the five-pointed star is interpreted as a demon as seen in the movie, from a historical perspective, its original female meaning is correct. But for a thousand years, the symbolic meaning of the five-pointed star has been distorted. The symbol is very flexible, and the meaning of the five-pointed star symbol was changed by the early Roman Catholic Church. As part of the Vatican's campaign to eliminate paganism and convert the public to Christianity, the Catholic Church launched a campaign to vilify pagan gods and goddesses and reinterpret their sacred symbols as evil symbols. This phenomenon is also common in troubled times. A new force will replace the existing symbols, belittle them for a long time, and attempt to completely erase their meaning. In the struggle between pagan symbols and Christian symbols, the pagans lost. Poseidon's trident became the devil's pitchfork, the conical pointed hat symbolizing wisdom became the witch's symbol, and Venus's five-pointed star became the evil symbol. Unfortunately, the military also misinterpreted the five-pointed star, and now it has become the most important symbol of war. Paint it on fighter planes and hang it on the shoulders of generals. In ancient Greece, people used a five-pointed star to form a big circle, in which stood a pattern of a "big" bodybuilding man, which represented the perfection of the human body and was also the "golden ratio" in the minds of artists at that time. Many mathematicians, geometricians and philosophers at all times and all over the world have proved its perfection in their own way!