A tachyon pulse inverter was an item of technology that utilized tachyons.

In ancient Egypt, an escaped alien criminal planned to harness the Nile's kinetic energy to power a tachyon pulse inverter. Its activation would have ignited Earth's atmosphere and burned half of its surface. The alien's plot was thwarted when the Doctor recaptured it. (TNG - Assimilation² comic: "Issue 1")

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