The Chinese word **烟囱** (yāncōng, meaning "chimney") is a compound formed by combining two characters: **烟** (yān), meaning "smoke" or "fume," and **囱** (cōng), an archaic character meaning "window" or specifically "opening on a roof." Together, they create a logical semantic compound where 囱 specifies the type of opening and 烟 specifies its function, literally forming the concept of a "smoke opening" or "smoke vent," which perfectly describes the purpose of a chimney.