Trititanium is a type of material used in the construction of Orion scoutship hulls.
Against Federation sensor probes, vessels with trititanium hulls appear either to have a high density level or seem as if they are partially cloaked. (TOS: "Journey to Babel")
- According to Gene Roddenberry, trititanium is the material from which the hull of the USS Enterprise is made of in his novelization of Star Trek: The Motion Picture.