The Secure Hash Standard (SHS) is a set of cryptographically secure hash algorithms specified by the National Institute of Standards and Technology (NIST).
The current version of the SHS standard is the document NIST FIPS 180-4, which specifies seven Secure Hash Algorithms: SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224 and SHA-512/256.
References
Secure Hash Standard Wikipedia(Text) CC BY-SA