A tetryon was a subspace-based subatomic particle. When they hit normal space, tetryons became highly erratic and unstable.

In 2367, the USS Prospect crew used their navigational deflector to emit a coherent graviton pulse to disperse a build-up of tetryon particles in the USS Artemis's stardrive section. The tetryon build-up was a result of a link between normal space and the M'Tar Domain. (Star Trek: The Prospect Chronicles: "Lady Lazarus")

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