Extremely productive — almost always appears as the top variant ⺮ (zhúzìtóu). Tags everything once made of bamboo: writing tools (笔 brush, 籍 register), counting and measuring (算 calculate, 答 answer, 等 wait/grade), tubes and pipes (管, 筒), musical instruments (笛, 箫), furniture and baskets (椅, 篮 — note 椅 actually uses wood). One of the strongest meaning clues in the script.