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len(x)

Definitions:

  The length of the string x in bits.
Sources:
NIST SP 800-135 Rev. 1 under len(x)

  For a bit string X, len(X) is the length of X in bits.
Sources:
NIST SP 800-185 under len(X)

  The bit length of the bit string X.
Sources:
NIST SP 800-38F under len(X)

  For the non-negative integer x, the bit length of the shortest bit string that can be  interpreted as a binary (i.e., base two) representation of the integer x. For integer x > 0, len(x) = ëlog2(x)û + 1. (In the case of 0, len(0) = 1.)
Sources:
NIST SP 800-56B Rev. 2 under len(x)

  The bit length of x.
Sources:
NIST SP 800-131A Rev.2 under len(x)