The electronvolt (eV) is a unit of energy.
The hydrogen molecule has a "threshold" of 14.7 electronvolts. (VOY: "Relativity")
A gamma scan revealed that the Crystalline Entity left behind a trail of antiprotons with a sharp spike at 10 keV. (TNG: "Silicon Avatar")
The tertiary subspace manifold, the home of a species of solanogen-based lifeforms, was located at a subspace energy level of 16.2 keV. (TNG: "Schisms")
In 2373, The Doctor purged Kes' body of chroniton radiation with antichroniton bursts ranging from 10 to 20 meVs. (VOY: "Before and After")