Isospin
Related quantum numbers:
- Baryon number: B
- Lepton number: L
- Weak isospin: T or T3
- Electric charge: Q
- X-charge: X
Read more about Isospin: Motivation For Isospin, Modern Understanding of Isospin, Isospin Symmetry, Relationship To Flavor, Quark Content and Isospin, Gauged Isospin Symmetry