is a main tool of diplomatic correspondence.

is a written communication  from a minister of foreign affairs to foreign diplomatic

envoys or other foreign government officials.

is a written form of communication that is used for foreign diplomats and Cabinet officials, Chargés d’Affaires, and

heads of international organizations.

is the third person note, less formal than a note, used in a diplomatic practice within the UN, as an alternative to a letter, for the

circulation to members of statements or reports.