Sm is the chemical symbol for the element samarium, which is a rare earth metal. It is part of the lanthanide series and has the atomic number 62. Samarium is silvery-white in color and is known for its magnetic properties, making it useful in various applications, including magnets and nuclear reactors. Samarium is often used in the production of samarium-cobalt magnets, which are known for their high resistance to demagnetization. Additionally, it plays a role in certain types of lasers and as a neutron absorber in nuclear reactors. Its compounds are also used in the manufacturing of glass and ceramics.