SIC

SIC codes, or standard industrial classification codes are four-digit numbers assigned by the U.S. government to every company based on its primary line of business. SIC codes were created in 1937, but replaced by NAICS codes in 1997, according to Investopedia.com. Marketers use the SIC and more recently the NAICS system to classify target industry segments and identify potential prospects. By utilizing these codes, marketers can gather data about potential customers, compare industry details from revenue to employee size and ultimately see better conversions and even an increase in ROI.