The chemical symbol for iodine is I. It is a key element in the periodic table, classified as a nonmetal under Group 17, which consists of halogens. Iodine plays a vital role in human health, especially in thyroid hormone production, which regulates metabolism and overall growth. It is found in various dietary sources, including seafood, dairy products, and iodized salt. Iodine is also used in medicine, particularly in antiseptics and imaging solutions. Its distinctive dark purple color solidifies the element's recognition among the public and scientists alike.