Wheel of Merits(功德轮):
In Chinese, it is pronounced as: gōng dé lún，Written as:

The Wheel of Merits, also known as a halo, is a luminous disc seen behind the Immortals, appearing across various cultures, symbolizing the authority and power of the Immortals or saints.
In different cultures, the halo carries various symbolic meanings. In Christianity, it is referred to as a “Nimbus” and is typically depicted as a golden circle, signifying authority and power. The color of the halo varies depending on the figure, with angels and Apostles often depicted with red or white halos, while ordinary saints are shown with deep purple ones. In Buddhism, the statues of Buddhas also feature halos, usually depicted as circular glowing rings, symbolizing the Buddha’s wisdom and compassion.
Moreover, the halo shares similar symbolic meanings across different cultures. For instance, in Chinese mythology, Immortals also have halos behind them, symbolizing their divine power and supernatural abilities. This feature appears across various cultures, possibly to express reverence and veneration towards these divine figures.