Murray Gell-Mann's Eightfold Way describes how combinations of it can lead to symmetry for mesons.
Three types of this property are represented by the basis states of the most commonly-used space obeying SU(3)   symmetry. The Cabibbo angle is defined relative to two eigenstates of this property. Hypercharge is the sum of the five numbers quantifying this property, one of which is isospin. The CKM matrix gives the probability that this property changes due to the weak force. "Truth" and "beauty" were the (*)  original names for two new options for this property introduced in the Standard Model's third generation. Neutrino oscillations change this property. Murray Gell-Mann's Eightfold Way describes how combinations of it can lead to symmetry for mesons. For 10 points, name this property that distinguishes the six known quarks, examples of which include up, charm, and strange.
Three types of this property are represented by the basis states of the most commonly-used space obeying SU(3)   symmetry.
quark  flavor  [or  flavour ] 