The yellow half represents civil tradition and the authority of the King, while the orange half signifies the Buddhist spiritual tradition. The Druk (Thunder Dragon) is white for purity, holding jewels representing wealth and perfection.
History
First designed in 1947 by Mayum Choying Wangmo Dorji. The dragon was initially green but later changed to white, and the shape was standardized in 1956.
Construction
A 2:3 ratio. Divided diagonally from the lower hoist to the upper fly, creating yellow (top) and orange (bottom) triangles with a white dragon across the dividing line.