The chemical element with the symbol 'Pb' is lead. Lead is a heavy metal known for its malleability and high density. It is primarily used in batteries, radiation shielding, and previously in paints and gasoline, though its use has decreased due to health and environmental concerns associated with lead exposure. Lead is toxic, particularly to the nervous systems of children, and can lead to serious health issues if ingested or inhaled. Because of these hazards, there have been regulations to limit lead in consumer products. Despite its risks, lead continues to have applications in infrastructure and industry, making it a material of interest.