Headquarters of the United Nations be sent by courier. The United Nations Postal Administration issues stamps, which must be used on stamped mail sent from the building. For award purposes, amateur radio operators consider the UN headquarters a separate "entity" under some award programs such as DXCC. For communications, UN organizations have their own internationally recognized ITU prefix, 4U. However, only contacts made with the UN Headquarters in New York, and the ITU count as separate entities. Other UN organizations such as the World Bank count for the state or country they are located in. The UN Staff Recreation Council operates amateur radio station 4U1UN,
Headquarters of the United Nations 193 UN member states, plus the UN flag, are flown in English alphabetical order. The General Assembly building, housing the United Nations General Assembly, holds the General Assembly Hall which has a seating capacity of 1,800. At long by wide, it is the largest room in the complex. The Hall has two murals by the French artist Fernand Léger. At the front of the chamber is the rostrum containing the green marble desk for the President of the General Assembly, Secretary-General and Under-Secretary-General for General Assembly Affairs and Conference Services and matching lectern for speakers. Behind the rostrum is the