The Ball is thought to represent a pearl. It is a symbol of the greatest treasure of all, wisdom.
In China, the pearl represents immortality, potentiality, and wisdom. Treasure dragons were believed to live in caves deep in the earth and to possess a magical pearl that multiplied if it was touched. This pearl was a symbol of the most valuable treasure which is wisdom. The ball has various meanings, the more popular one is that the ball is a wealth ball which brings wealth and prosperity. Other meanings include medicine balls, pearls of wisdom, and a peach or apricot representing health and prosperity. A Buddha holding two balls one in each hand represents wealth