The right-most bit(s) of a bit string.
Source(s):
NIST SP 800-38A
under Least Significant Bit(s)
NIST SP 800-38B
under Least Significant Bit(s)
NIST SP 800-38C
under Least Significant Bit(s)
NIST SP 800-38D
under Least Significant Bit(s)
NIST SP 800-38F