IUPAC is the universally-recognized authority on chemical nomenclature and terminology and two IUPAC bodies take leading roles in this activity: Division VIII – Chemical Nomenclature and Structure Representation and the Interdivisional Committee on Terminology, Nomenclature, and Symbols. As one of its major activities, IUPAC develops Recommendations to establish unambiguous, uniform, and consistent nomenclature and terminology for specific scientific fields, usually presented as: glossaries of terms for specific chemical disciplines; definitions of terms relating to a group of properties; nomenclature of chemical compounds and their classes; terminology, symbols, and units in a specific field; classifications and uses of terms in a specific field; and conventions and standards of practice for presenting data in a specific field. The Recommendations are published in the IUPAC journal, Pure and Applied Chemistry (PAC) and journal issues are freely-available in the year following their publication. They also appear in the IUPAC Standards Online database one year after publication in PAC. Information on chemical nomenclature and terminology can also be accessed through the IUPAC Color Books or the Brief Guides to Nomenclature.