Dy, or Dysprosium, is a chemical element with the symbol Dy and atomic number 66. It is a rare earth metal that belongs to the lanthanide series on the periodic table. Dysprosium is known for its high magnetic susceptibility and is often used in various applications, including neodymium magnets and nuclear reactors. This element is silvery-white in color and has a relatively high melting point of 1,412 °C (2,574 °F). Dysprosium is primarily obtained from minerals such as monazite and bastnäsite. Due to its unique properties, it plays a crucial role in the production of advanced materials and technologies.