This International Standard defines physical quantities in the field of the ergonomics of the thermal environment. The corresponding symbols and units are also listed. The aim of this International Standard is — to give vocabulary and symbols for the quantities used in International Standards on ergonomics of the thermal environment, — to provide a reference of vocabulary and symbols to be used in writing future International Standards or other publications on the ergonomics of the thermal environment. NOTE This International Standard will allow the correct inclusion of vocabulary and symbols in new International Standards or during the revision of existing standards (see the Bibliography) when they are required.