T

Top

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 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.