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The HSN is a multipurpose international product terminology acknowledged by the World Customs Organization. The purpose of using the HSN codes is to ensure that GST billing practices are in accord with international standards of product nomenclature.
In the United States, a Social Security number (commonly known as SSN) is a number issued to U.S. citizens, permanent residents, and people that are temporarily working in the country. The number is issued to an individual by the Social Security Administration, an agency of the federal government.