Tritium
Tritium is a basic atomic element, an isotope of hydrogen. Its nucleus consists of a proton and two neutrons. 

Deuterium with an admixture of tritium was used as fuel in matter-antimatter reactions aboard starships like the . It was stored in the deuterium tank. ( okudagram; )

Aboard the  , in the Engineering Systems Database, there were folders titled "Deuterium/Tritium Loading Procedures" and "Deuterium/Tritium Tankage Transfer and Safety". These folders contained technical manuals relevant to the topic. ( okudagram)

In late 2375, tritium proved to be extremely important in helping the Federation Alliance to win the Dominion War. A Klingon chief engineer aboard the  adjusted the tritium intermix to compensate for a warp core containment problem. During the Second Battle of Chin'toka, the tritium made the ship invulnerable to the Breen energy-dampening weapon. ()

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