While the white on the South Korean flag symbolizes peace and purity, what do the trigrams on each corner of the flag stand for?

Answer Yin and Yang

The Taegukgi is South Korea's national flag. Colored red, white, and blue, it has four black trigrams called Kwae, representing yin and yang, of the concept of harmony. The three bars of each Kwae are broken (yin) and unbroken (yang).

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