Size of this South Korea flag patch: 6.5 x 4 cm (2.56 x 1.57 inch)
The flag of South Korea consists of a white base, which is the traditional color of the Korean people. In the center of the flag you'll find a blue and red circle, which is surrounded by four black trigrams, one in each corner. These trigrams represent the elements of fire, water, earth, wood, and metal.
What does the emblem in the centre mean?
The emblem in the centre of the South Korean flag stands for the dual forces of yin (blue) and yang (red). The yin and yang balance each other and maintain a harmonious existence by being complementary opposites: night and day, passive and active, negative and positive, male and female etc. Yin is the passive or static mode and yang the active or dynamic mode.
Fun fact about the South Korea flag patch
In Korean the national flag is called 'Taegukki' ('Great Polarity'), taking its name from the central emblem on the flag, which is called a 'taegeuk circle'.