The flag of the United Nations was adopted on October 20, 1947, and consists of the official emblem of the United Nations in white on a blue background. The emblem’s design is described as:
A map of the world representing an azimuthal equidistant projection centred on the North Pole, inscribed in a wreath consisting of crossed conventionalized branches of the olive tree, . . . The projection of the map extends to 60 degrees south latitude, and includes five concentric circles.
—Official Seal and Emblem of the United Nations, Report of the Secretary-General, 15 October 1946
Authors bio is coming up shortly. 