The International Union of Pure and Applied Chemistry (IUPAC), also known as the International Union for Theoretical (Chemical) and Applied Chemistry (IUPAC), is a non-governmental organization dedicated to promoting chemistry-related activities. It is also a joint organization of chemical societies of various countries. Known as the recognized authority on chemical nomenclature. The Sub-Committee on Nomenclature and Symbols will revise the IUPAC nomenclature in an effort to provide accurate rules for naming compounds.