national flag consisting of a diagonal yellow stripe separating a green triangle at the hoist from a red triangle at the fly end. It has a width-to-length ratio of 2 to 3.

The French colony originally known as the Middle Congo established an autonomous republic on November 28, 1958, following the referendum held throughout the French colonial empire under the terms of its new Fifth Republic constitution. Since these autonomous republics had no international status, their adoption of national symbols was slow. In the case of the Congo, it was not until August 18, 1959, that the Legislative Assembly gave consideration to a flag that could fly together with the French Tricolor (France, flag of) to represent the Congo. Following debate, the assembly chose a flag of the pan-African colours (red, yellow, and green) arranged in a unique diagonal pattern. Two of the colours were attributed with symbolism—green was for agriculture and forests and yellow for the friendship and nobility of the people—but the red was unexplained. The flag became official on September 15, 1959, and did not change when independence was attained on August 15, 1960. On December 30, 1969, a new Marxist regime altered the national flag; in its design the colour red became associated with the fight for liberation, green with peace, and gold (in a star symbol) with hope. Owing to the economic failure of the Marxists, however, free elections were organized in the early 1990s. The newly appointed regime reverted to the original flag of the Congo on June 10, 1991.