See organization-defined control parameter.
Source(s):
NIST SP 800-37 Rev. 2
under control parameter
The variable part of a control or control enhancement that can be instantiated by an organization during the tailoring process by either assigning an organization-defined value or selecting a value from a pre-defined list provided as part of the control or control enhancement.
Source(s):
NIST SP 800-37 Rev. 2