Harmonized System Harmonized System Code hier Harmonized System World Customs Organization puts it World Customs Organisation - Harmonised System (HS) Harmonized Commodity Description and Coding System Harmonized System Code WCO wcoomd.org Source. Harmonized System Classification What is the Harmonized System (HS)? Harmonized Commodity Description and Coding System WCO website Harmonised System Harmonized System hier WCO website HS — Harmonized System