pencil lead (graphite core of a pencil)

lead (chemical element, Pb)

used in the place name 铅山 yán​shān, a county in Jiangxi province; also used as a surname in Taiwan

literary variant of 沿 yán, meaning to follow a route or to go along

to follow a path or tradition; to carry on; to trim a border with braid or tape; a border or edge

(bound form) the metallic element lead (Pb); graphite used in a pencil lead