The flower on the front side of the piece is called a peony, "牡丹 mu dan," a symbol of prosperity, wealth, and flourishment. It is also considered the national flower of China due to its symbolization of propsperity and a thriving society.
The back side of the Lock piece is carved with four traditional Chinese characters, reading from left to right: 玉堂富貴 yù tang fù guì, saying “wish the honorable household prosperity and wealth.” Also, flowers like begonia, peony, magnolia, are culturally associated with the meaning of prosperity and luxuriance.
In addition, the shape of lock indicates that the lock stores and locks the prosperity and wealth in it. In this way, the lock metaphorizes the action of storing and collecting good fortune.