What do the five-color prayer flags represent?

Yellow represents the noble temperament of the earth and the royal family; Blue represents blue sky, strength and King Kong Bodhisattva; Red represents the sun, compassion and Guanyin bodhisattva; White represents white clouds and purity; Green represents the jungle, wisdom and manjusri bodhisattva.

As far as its external form is concerned, prayer flags can be roughly divided into three types: one is blue, white, red, green and yellow squares printed with Buddha's teachings and birds and animals, which are sewn one by one on a long rope and hung between two hills. Such prayer flags are common in sparsely populated mountainous areas. The second kind of prayer flags are narrow strips of cloth three to five meters long, which are single in color, either white or red. It is printed with the teachings of the Buddha, and one side of the cloth is sewn on a thick warp beam and inserted in front of the hospital. This kind of prayer flag is more common in Gongbulin District. This is the kind of warp beam inserted in the Jokhang Temple Square in Lhasa, but it is more exquisite. The third kind of prayer flags are glittering flags in five colors: blue, white, red, green and yellow, and a main square cloth with a monochrome edge, on which the teachings of the Buddha and the patterns of birds and animals are printed. These banners are hung on willow branches respectively, becoming prayer flags. Such prayer flags can be seen everywhere on the roofs of residential buildings in the ancient city of Lhasa. As a symbol of good luck, prayer flags need to be renewed every year. You can't just choose a new day. It is based on the Tibetan calendar, and you choose a good day after the first day of the new year in the Tibetan calendar. This morning, all the people in the hospital put on their holiday costumes and gathered on the roof to hold a grand and happy prayer flag insertion ceremony. In Tibetan, this ceremony is called holding the ear, which means offering sacrifices to the gods and praying for blessings.