http://inspire.ec.europa.eu/codelist/CommodityCodeValue/rheniumINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 18:11 PM CEST2015-08-18 18:11 PM CESTrheniumRhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. - http://en.wikipedia.org/wiki/Rhenium