Règle correspondante
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Section C. Definition of parlementaires
Nigeria’s Manual on the Laws of War states: “The usual agents in non-hostile intercourse between belligerents are known as parlementaires. The parlementaires must carry a white flag … [and] an authorisation in writing signed by the sending commander.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 24.