United Nations Standard Products and Services Code
"The United Nations Standard Products and Services Code® (UNSPSC®) provides an open, global multi-sector standard for efficient, accurate classification of products and services. Search the code on this website to locate commodity codes that can be used by your company. The UNSPSC offers a single global classification system that can be used for: Company-wide visibility of spend analysis, Cost-effective procurement optimization, Full exploitation of electronic commerce capabilities. The UNSPSC is a hierarchical classification with five levels. These levels allow analysis by drilling down or rolling up to analyze expenditures. Each level in the hierarchy has its own unique number."