Lead is a chemical element with the symbol Pb (from the Latin word plumbum) and atomic number 82. It is a heavy metal and has unique physicochemical properties, such as high density, low melting point, and high corrosion resistance. Lead has been used for a variety of purposes throughout human history, including in plumbing, gasoline, paint, and batteries. However, lead exposure is linked to a number of health problems, especially in children, including anemia, developmental delays, and damage to the nervous system. Lead poisoning can occur through ingesting contaminated food, water, or paint, inhaling lead dust or fumes, or handling lead objects without proper protection.