In the Active Directory® schema, Top is the object class from which all
other object classes are ultimately derived.
tombstone
A deleted object that remains in temporary storage. After a
preconfigured amount of time, the object is permanently
deleted.
trustee
In Microsoft® Windows NT® security, a trustee is the user
account, group account, or logon session to which an access-control
entry (ACE) applies. Each ACE in an access-control list (ACL)
applies to one trustee.