NAICS stands for North American Industrial Classification. It is a system to classify industries. It can be used to search for your industry in government and library sources. It is divided into:
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2-digit code: industry sector
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3-digit codes: subsectors
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4-digit codes: industry groups
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5-digit codes: industries
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6-digit codes: Canadian industries
There are 2 versions:
Example:
31-33 is the 2-digit code for Manufacturing
3242 is the 4-digit code for Petroleum and coal product manufacturing
32411 is the 5-digit code for Petroleum refineries
324110 is the 6-digit code for Petroleum refineries