1, the phoenix spreads its wings, also known as the phoenix comes to the ceremony, meaning that the phoenix flies and dances in a beautiful manner. In ancient times, it was used as a metaphor for auspicious signs and auspicious sensations.
2. Sources:
(1) The Book of Han - Wang Mang biography: "Manna from the world, sweet springs from the ground, the phoenix came to the ceremony, the gods descended to set."
(2) "Shangshu - Yiji": "Xiao Shao" nine into, the phoenix to Yi" "Romance of the Three Kingdoms" 80: "Since the king of Wei to the throne, the unicorn descended, the phoenix to Yi."