Cyanocobalamin is the most common and widely produced form of the chemical compounds that have vitamin B12 activity.
For example, the hadron constituents of atomic nuclei, neutrons and protons, have charges of 0 e and +1 e respectively; the neutron is composed of two down quarks and one up quark, and the proton of two up quarks and one down quark.
Protons are made of two Up and one Down quark. The neutron is made of two Down and one Up quark. Truth and Beauty quarks were called T and B when originally proposed, to be Top and Bottom in analogy with the nucleon quarks that had just been renamed the Up and Down quarks.