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  Concatenation; e.g. A || B is the concatenation of bit strings A and B.
NIST SP 800-106

  The concatenation of binary strings A and B.
NIST SP 800-108 under A|| B

NIST SP 800-133 Rev. 2
NIST SP 800-133 [Superseded]
NIST SP 800-133 Rev.1 [Superseded]

  Concatenation operation; for example, a || b means that string b is appended after string a.
NIST SP 800-135 Rev. 1