This refers to a predicament from which there is no escape because of conditions which contradict or exclude each other. It comes from Joseph Heller's novel Catch22 in which a bomber pilot pretends to be insane so that he will be grounded, but his wish to avoid danger shows his sanity.
White stands for Islam, peace, optimism, light, and love. Red recalls the martyrs of Sudan and the people's struggle. Black stands for Sudan and the Mahdiya revolution of the 1880s. Effective date: 20 May 1970.