In Tibet, red is fire, white is cloud, green is water, blue is sky, what does yellow stand for?

The celestial burial platform with the unique cultural style of Tibetan funeral customs is located halfway up the mountain, surrounded by two square curtains like fences, surrounded by countless strips of cloth and ribbons of various colors, surrounded by red, white and blue cloth, with banners made of blue, white, red, yellow and green. According to Buddhist scriptures, blue represents the sky, white represents clouds, red represents the sun, yellow represents the earth (also represents good luck), and green represents water. Heaven, earth, clouds, fire and water are a material world, and people should always pay tribute to the gods (gods and mountain gods) who dominate everything in this universe with gratitude.