Why are the traditional auspicious patterns in China all multiples of three?

Judging from the traditional culture of China, "3" is an auspicious number and a good omen. For example, when the Year of the Sheep arrives, what everyone talks about most is "Three Yang's opening Thailand". The traditional auspicious pattern of the Han nationality is "Three Nights and Nine Ru Ru", which means many blessings, many lives and many children. Lucky words, Fu Lushou, Samsung and so on.

In addition, the ancients used "three" to express religious etiquette and social life. For example, there are three salutes, three bows and three years of mourning. You should think twice before you do anything. Men should stand at the age of 30, be filial to their parents, and don't be "three unfilial, nothing is great."

In Pythagoras' eyes, "three" is a harmonious number, while Aristotle believes that "three" represents wholeness, because "three" has both a beginning and an end and a middle. Taoism also believes that "three" is a symbol of strength, because it implies a central element.