The flag of the United Arab Emirates was adopted on 2 December 1971 after signing the union of 6 (on 7) emirates (Abu Dhabi, Dubai, Sharjah, Ajman, Umm al-Quwain and Fujairah – Ras al-Khaimah joined the following year). The colors of the flag are the pan-Arab ones, which symbolize Arab unity; the pan-Arab colors (white, black, red and green) have their origin in 1917 with the Hashemite flag of the Arab Revolt. These colors do not occur uniformly in all the Arab flags. [The Arab Revolt (1916–1918) (Arabic: الثورة العربية Al-Thawra al-`Arabiyya) (Turkish: Arap İsyanı) was initiated by the Sherif Hussein bin Ali with the aim of securing independence from the ruling Ottoman Turks and creating a single unified Arab state spanning from Aleppo in Syria to Aden in Yemen. source: wikipedia]
The flag of the Arab Revolt was forerunner of the many flags of the post-colonial Arab world, the colors shown indicate the following: fertility (green), a neutral (white), the oil wealth in the borders of the country (black) , the blood spilled to defend their land (red).
In the civil and state flag of United Arab Emirates proportions are 2:1
In some cases the flag at its center has the presidential emblem:
The emblem of the above flag, was in use from 1973 to 2008, then replaced by the one shown in the picture gallery. Each emirate (except Fujairah) also has its own flag. Here is also a painting by the Italian artist Paola Zannoni, realized in occasion of the National Day in 2011 (the 40th anniversary of the foundation of the United Arab Emirates).