Scandium is a chemical element with the symbol Sc and atomic number 21. It is a silvery-white, rare-earth metal that is found in various minerals. Some common synonyms for scandium include scandia, ekaboron, and eka-aluminum. It is a highly reactive metal and is commonly used in the aerospace industry, particularly in the production of high-strength aluminum alloys. Scandium has a range of other applications, including in the medical industry, in lighting technology, and in the production of sports equipment. Due to its high cost and rarity, the use of scandium is limited, but it continues to be a valuable resource for various industrial processes.