ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Terbium Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Wikipedia https://en.wikipedia.org/wiki/Terbium Added to support Critical Zone Observatory (CZO) data use cases.