GeV
A unit of energy, representing 10^9 Electron Volts.
One electron volt is the energy gained by an electron when accelerated through a potential different of 1 volt.
GeV is commonly also used as a short hand to represent Natural Units of momentum (GeV/c) and mass (GeV/c^2), since in Natural Units c=1.
ChrisRJones - 12 Nov 2005