池: Pond, city moat, theater pit. It also refers to a place or the name of a pool, such as a dance floor or the Jade Pool (a mythical place in Chinese lore), extending to mean something exceptionally solid and unyielding.
澹: Tranquil and serene. A man of purity, a gentleman, beloved by all.
Meaning: Harmonious in rhythm, 'Chi' symbolizes a pond, and 'Dan' represents tranquility, evoking a serene and profound essence like water.