Masthead documents are issued on items of the agenda to be discussed during meetings of the principal organs. Some of these are later reprinted as annexes to the Official Records. In masthead form these documents are identified by a document symbol denoting the issuing body (i.e., T/-), as well as an indication of the agenda item to which they pertain.
Masthead documents are also issued by the subsidiary bodies of the principal organs. Among others these include, for example, standing, permanent and main committees (i.e., A/C.1/-), Ad hoc committees (i.e., A/AC.-), commissions (i.e., A/CN.-), and conferences (i.e., A/CONF/-).
The Secretariat issues masthead documents on a variety of subjects. The majority of the documents in the "ST/..." series are administrative instructions as well as reports and studies prepared by different offices.

See also: UN Symbols