Tiberium is a volatile element used in the powering of several common types of power systems. Matthew Donahugh lived on board the SS Peloponnesus, a tiberium freighter owned by his family, for most of his childhood and teenage years. (Star Trek: Remington)
Background[]
Tiberium is, of course, a reference to the element of the same name from the Command & Conquer series of video games.