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X || Y

Definition(s):

  For strings X and Y, X || Y is the concatenation of X and Y. For example, 11001 || 010 = 11001010.
Source(s):
NIST SP 800-185

  Concatenation of two strings X and Y.
Source(s):
NIST SP 800-56B Rev. 2
NIST SP 800-56B Rev. 1 [Superseded]

  Concatenation of two strings X and Y. X andYare either both bitstrings or both byte strings.
Source(s):
NIST SP 800-90A Rev. 1

  Concatenation of two bit strings X and Y.
Source(s):
NIST SP 800-56A Rev. 2 [Superseded]