ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Zirconium Zirconium is a chemical element with symbol Zr and atomic number 40. The name zirconium is taken from the name of the mineral zircon, the most important source of zirconium. Wikipedia https://en.wikipedia.org/wiki/Zirconium Added to support Critical Zone Observatory (CZO) data use cases.