About
The character "炷" is structured with the fire radical (火) paired with the component "主", which primarily serves a phonetic function. Its etymology traces back to denoting the wick of a lamp or candle, the part that holds and sustains the flame. From this concrete noun, its meaning expanded to include the action of burning or lighting such wicks, and it later evolved into a measure word for items like incense sticks, which involve similar combustion processes.
Etymology Hide
