IUPAC Recommendations  are the output of IUPAC Projects or other studies  on nomenclature, symbols, terminology, or conventions, and their purpose is to recommend  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 development of IUPAC Recommendations as well as that of IUPAC Technical Reports is conducted in a manner to ensure that the widest possible consensus has been reached among all IUPAC Divisions and other bodies of the Union,  between IUPAC and other bodies of the International Council for Science (ICSU), the international standardizing organizations, and the Conference Generale des Poids et Mesures (CGPM) and its Committees.  The IUPAC Inter-divisional Committee on Terminology, Nomenclature and Symbols (ICTNS) coordinates the standardization activities and the  output of such activities are released as Provisional Recommendations for public review and commentary.  Following approval, the Final Recommendations are published in IUPAC’s journal Pure and Applied Chemistry (PAC) or books, including the so-called Color Books. The basics of organic nomenclature, of inorganic nomenclature and polymer nomenclature are also summarized in a collection of Brief Guides.

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