The flag of South Korea has four trigrams..........from the I Ching.........

Flag of South Korea

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The Flag of South Korea, also known as the Taegukgi, has three parts: a white rectangular background, a red and blue Taeguk, symbolizing balance, in its center, and four black trigrams selected from the original eight, one toward each corner. Wikipedia

Use: National flag, Ensign

Adopted on: 1948

Proportion: 3:2

Country: South Korea