Standard Industrial Classification codes classify a business or facility according to its primary kind of activity, such as chemical manufacturing or electricity generation. Two-digit codes are the most general, four-digit codes are the most specific (although some unofficial sources use codes up to eight digits); RSEI uses two-digit, three-digit, and four-digit codes.
SIC CODES
Meaning of SIC CODES in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012