- an aluminum coin of modern Greece until the euro was adopted, one 100th of a drachma.
- a small copper or bronze coin of ancient Greece.
- any of a class of particles with spin of ½ that are not subject to the strong force and that are believed to be truly elementary and not composed of quarks or other subunits. The leptons known or believed to exist are the electron and electron-neutrino, the muon and mu-neutrino, and the tau lepton and tau-neutrino.
- a former Greek monetary unit worth one hundredth of a drachma
- a small coin of ancient Greece
- any of a group of elementary particles and their antiparticles, such as an electron, muon, or neutrino, that participate in electromagnetic and weak interactions and have a half-integral spin
