炉子
lú zi · HSK 7
stove
🔥 炉 = fire radical 火 + 户 (household); 子 is a noun suffix — the household fire-box, a stove
The 火 fire radical on the left flags anything that burns or heats; 户 (household/door) sits on the right. Add the noun suffix 子 (zi) and you get 炉子: the thing that holds the household fire — a stove, oven, or furnace.
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.