EG, RUST is a combination of two elements that are commonly found together. The first element, EG, is an abbreviation for the chemical element einsteinium, which is a radioactive element with atomic number 99. The second element, RUST, is an OXIDE of iron, which is a common form of corrosion that can be seen on metal surfaces. Together, these two elements form a compound known as einsteinium OXIDE, which is a highly reactive material that is used in nuclear reactors and other industrial applications.