B−L
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In high energy physics, B−L (pronounced "bee minus ell") is the baryon number minus the lepton number. This is the charge of a global/gauge U(1) symmetry in some GUT models, called U(1)B−L. Unlike baryon number alone or lepton number alone, this hypothetical symmetry is not broken by chiral anomalies or gravitational anomalies, as long as this symmetry is global, which is why this symmetry is often invoked. If B−L exists as a symmetry, it has to be spontaneously broken to give the neutrinos a nonzero mass if we assume the seesaw mechanism.
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