Lepton number assigns to leptons, to antileptons and zero to quarks. Neutrino masses show that separate family lepton numbers need not be exact.
A neutrino is an electrically neutral spin-one-half lepton. The Standard Model has three active neutrino flavours associated with the electron, muon and tau.
An antineutrino is the antiparticle of a neutrino and carries the opposite additive lepton number.

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Lepton number is a conserved quantum number in particle physics that is used to describe the number of leptons in a system. Leptons are a family of elementary particles that include charged leptons (such as electrons, muons, and tau particles) and neutral leptons (such as neutrinos). The lepton number is defined as follows: - Each lepton (such as an electron or a neutrino) has a lepton number of +1.
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