池子
chí zi · HSK 5
pond
🏊 池子 = 池 (pool) + 子 (noun suffix); literally 'pool-thing'
池 means pond or pool; 子 is a common noun suffix (like 桌子 table, 椅子 chair). So 池子 is the colloquial word for a pool — water pool, bathhouse pool, or by extension the open floor of a theater or ballroom.
子 — pictograph of a baby/child with arms out
子 began as a pictograph of a swaddled infant with a large head and outstretched arms, originally meaning 'baby' or 'child.' From there it broadened to 'son,' 'offspring,' and a respectful suffix for masters like 孔子 (Confucius). It also became one of the twelve earthly branches.