From the United Nations: Intended to be a standard classification of all productive economic activities. Its main aim is to provide a set of activity categories that can be used when analyzing statistics according to such activities. The detailed groups and classes of the ISIC are best suited for classifying the kind of economic activity of establishments. The ISIC Rev. 3 is a classification by activity. The activity carried out by a statistical unit is the type of production in which it engages.
For European industries, use: NACE codes.
For Australia and New Zealand, use: ANZSIC.
For Japan, use: JSIC.
For the United Nations, use: ISIC or ISCO.
From the U.S. International Trade Commission. Designed to enable importers, custom brokers, Customs officers and other interested persons to determine both (1) the classifications of and the rates of duty applicable to imported articles and, (2) the requirements for reporting statistical data with respect to such imports.