Social Security number

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What Wikipedia says

In the United States, a Social Security number (SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2).

Excerpt from the Wikipedia article “Social Security number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: United States Social Security Administration, Public domain, via Wikimedia Commons.