ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Gallium Gallium is a chemical element with symbol Ga and atomic number 31. It is in group 13 of the periodic table, and thus has similarities to the other metals of the group, aluminium, indium, and thallium. Wikipedia https://en.wikipedia.org/wiki/Gallium Added to support Critical Zone Observatory (CZO) data use cases.