Issued by United Nations Statistical Office

http://unstats.un.org/unsd/cr/registry/regct.asp?Lg=1

Industry

Public

The International Standard Industrial Classification of All Economic Activities or ISIC is a United Nations system for classifying economic data.

Wide use has been made of ISIC, both nationally and internationally, in classifying data according to kind of economic activity in the fields of production, employment, gross domestic product and other statistical areas. ISIC is a basic tool for studying economic phenomena, fostering international comparability of data, providing guidance for the development of national classifications and for promoting the development of sound national statistical systems. International Standard Industrial Classification PDF

http://en.wikipedia.org/wiki/International_Standard_Industrial_Classification