Black lead is a term commonly used to describe graphite, a mineral commonly used in pencils and other writing tools. However, there are several synonyms for black lead that are less commonly known. These include plumbago, carbongraphite, and mineral carbon. Additionally, graphite is sometimes called lead even though it doesn't contain lead at all. This is because graphite was originally mistaken for a type of lead ore. Despite the many synonyms for black lead, the term is still widely used and recognized in various industries, including art, engineering, and manufacturing.