Topness vs. Isospin

Difference Between Topness and Isospin
Topnessnoun
(physics) A quantum number of quarks and hadrons, determined by the number(s) of top quarks and antiquarks present. Symbol T.
Isospinnoun
A quantum number related to the number of charge states of a baryon or meson.
Isospinnoun
(physics) A quantum number or symmetry related to the strong interaction.