Indium is a rare element, number 40 in the periodic table with the symbol In. This is a rare, soft, malleable and easily fusible metal which is chemically similar to aluminum or gallium but more closely resembles zinc. Zinc ores are the primary source of Indium. The leading end use is thin-film coatings for electroluminescent lamps and to form transparent electrodes from indium tin oxide in liquid crystal displays. It is also widely used for making particularly low melting point alloys, and is a component in some lead-free solders.