Definiciones
1.NounThe 1- to 3-letter international code for a chemical element. It is the same in all languages. Thus, gold always has the chemical symbol "Au", regardless of what people call it in their language.
2.Nouna similar symbol used to denote a different chemical entity, such as an isotope (e.g. D = deuterium, though "H" is more correct), a radical (e.g. Ph [or Φ] = phenyl), an unknown (e.g. M = a metal, or X = a halogen), etc.