- Black lead - Golf club material - Golf-club material - Lead pencil substance - Lead pencil's lead, misleadingly - Native carbon in hexagonal crystals, also foliated or
granular massive, of black color and metallic luster, and so soft as to
leave a trace on paper. It is used for pencils (improperly called lead
pencils), for crucibles, and as a lubricator, etc. Often called
plumbago or black lead.