Standard Industrial Classification - SIC.
TheSIC Manual was last revised in 1987; it provides the government-assigned (four-digit) numerical codes for identifying industries, businesses, and products. With the adoption of the North American Free Trade Agreement, the SIC is officially replaced by NAICS. However, some industry publications still provide data based on the SIC (Print copy is available in the Ready Reference. HF 1042 .A55 1987).