Trilithium is in Star Trek as well, so that's taken.![]()
Tritium
Tritium is a basic atomic element, an isotope of hydrogen. Its nucleus consists of a proton and two neutrons. It has a short half-life and emits low levels of radiation. One of the by-products of cold fusion was tritium. (SNW: "Tomorrow and Tomorrow and Tomorrow") During the 1980s on Earth...memory-alpha.fandom.com
I think I might be right... (and yes I know that dilithium Crystal's are used too).