None
An assessment object that includes specific protection-related items (e.g., hardware, software, or firmware) employed within or at the boundary of an information system.
Source(s):
CNSSI 4009-2015
NIST SP 800-53A Rev. 1
NIST SP 800-137
under Mechanisms
NISTIR 7298
NIST SP 800-53A Rev. 4
under Mechanisms