The word 心脏 (xīnzàng), meaning "heart", is formed through a logical and visually descriptive combination of two characters. The first part, 心, is a pictograph representing the physical shape of the heart and is the core symbol for the concept. The second character, 脏, means "internal organ" and acts as a categorical clarifier. Together, they specify that this is not the metaphorical or emotional "heart" (which 心 can represent alone), but specifically the physical, biological organ housed in the chest, creating a precise and concrete term.