The lexicon of the top500 ( The Encyclopedia for Classification Codes ) explains the codes and definitions in the world of economical classifications.
The UNSPC Code
The UNSPC Code is described as
UNSPC Segments
Each level contains a two-character numerical value and a textual description as follows:
XX Segment The logical aggregation of families for analytical purposes
XX Family A commonly recognized group of inter-related commodity categories
XX Class A group of commodities sharing a common use or function
XX Commodity A group of substitutable products or services
XX Business Function The function performed by an organization in support of the commodity (optional and not listed here)
The following shows the first level (Segments). Any link brings you via the subdivisions (Fammilies and classes) and finally to the products and services (Commodities).
10.00.00.00 Live Plant and Animal Material and Accessories and Supplies
11.00.00.00 Mineral and Textile and Inedible Plant and Animal Materials
12.00.00.00 Chemicals including Bio Chemicals and Gas Materials
13.00.00.00 Resin and Rosin and Rubber and Foam and Film and Elastomeric Materials