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OU - Organization Unit
This is a Windows term referring to an organizational structure (OU). The term can refer to the structure itself or the general environment under that structure.
A Windows OU is an organization unit (a directory container) for grouping similar accounts or machines. OUs provide a means of delegating authority over a group of accounts or machines to a person (the local administrator). OUs do not require a domain controller or any other physical representation. They are simply a container in the domain database. OUs can contain other OUs to a level of 63 deep. OUs can duplicate actual organizational structure. However, this isn't always recommended.