The chemical symbol for sulfur is S. It is a non-metal element found in group 16 of the periodic table, with an atomic number of 16. Sulfur exists in various allotropes and is commonly found in nature as an essential component of proteins and other biological molecules, particularly in amino acids like cysteine and methionine. It plays a vital role in various industrial applications, including the production of sulfuric acid, fertilizers, and pharmaceuticals. Additionally, sulfur compounds are responsible for the characteristic smell of rotten eggs, which often alerts people to its presence.