In the United States the SIC code is being supplanted by the six-digit North American Industry Classification System (NAICS code), which was released in 1997; however certain government departments and agencies, such as the U.S. Securities and Exchange Commission (SEC), still use the SIC codes.
https://en.wikipedia.org/wiki/Standard_Industrial_Classification
The Standard Industrial Classification SIC is a system for classifying industries by a four-digit code. Established in the United States in 1937, it is used by government agencies to classify industry areas. The SIC system is also used by agencies in other countries, e.g., by the United Kingdom's Companies House.
https://en.wikipedia.org/wiki/Standard_Industrial_Classification
Definition of sic. : intentionally so written —used after a printed word or passage to indicate that it is intended exactly as printed or to indicate that it exactly reproduces an original said he seed [sic] it all.
https://www.merriam-webster.com/dictionary/sic
Standard Industrial Classification (SIC) System Search. This page allows the user to search the 1987 version SIC manual by keyword, to access descriptive information for a specified 2,3,4-digit SIC, and to examine the manual structure.
https://www.osha.gov/pls/imis/sicsearch.html
Using [sic] Properly. Sic is a Latin term meaning “thus.” It is used to indicate that something incorrectly written is intentionally being left as it was in the original. Sic is usually italicized and always surrounded by brackets to indicate that it was not part of the original. Place [sic] right after the error.
http://data.grammarbook.com/blog/definitions/sic/
sic. 1  Square brackets are most commonly used around the word 'sic' (from the Latin 'sicut', meaning 'just as'), to explain the status of an apparent mistake. Generally, sic means the foregoing mistake (or apparent mistake) was made by the writer/speaker I am quoting; I am but the faithful messenger; in fact I never get anything wrong myself.
http://www.urbandictionary.com/define.php?term=sic
What is NAICS? NAICS is a New Industry Classification System. After 60 years of use, the outdated Standard Industrial Classification (SIC) system was retired and replaced by the new North American Industry Classification System (NAICS). NAICS is the product of a collaborative effort between the United States, Canada, and Mexico.
https://www.bls.gov/sae/saewhatis.htm
Though occasionally misidentified as an abbreviated word, sic is a Latin adverb used in English as an adverb, and, derivatively, as a noun and a verb. The adverb sic, meaning intentionally so written, first appeared in English circa 1856. It is derived from the Latin adverb sīc, which means so, thus, in this manner.
https://en.wikipedia.org/wiki/Sic
Standard Industrial Classification (SIC) System Search. STATISTICS & DATA | SIC MANUAL. This page allows the user to search the 1987 version SIC manual by keyword, to access descriptive information for a specified 2,3,4-digit SIC, and to examine the manual structure. Search Help and Examples.
https://www.osha.gov/pls/imis/sicsearch.html
The adverb sic, usually enclosed in brackets, is a word editors use in the reproduction of someone else's speech or writing to indicate that an unexpected form exactly reproduces the original and is not a copier's mistake. Sic comes from Latin, in which it means so or thus..
https://www.merriam-webster.com/dictionary/sic
what is [sic]?
The Standard Industrial Classification is a system for classifying industries by a four digit code. SIC is a system for classifying industries by a four digit code.