Taegeuk (Korean: 태극) is a Korean term cognate with the Chinese term Taiji (Wade-Giles spelling: T'ai-chi), meaning "supreme ultimate", although it can also be translated as "great polarity / duality". The symbol was chosen for the design of the Korean national flag in the 1880s. The Taegeuk diagram has been existent for the majority of written Korean history. The origins of the interlocking-sinusoid design in Korea can be traced to as early as the Goguryeo or Silla period, e.g. in the decoration of a sword, dated to the 5th or 6th century, recovered from the grave of Michu of Silla, or an artifact with the taegeuk pattern of similar age found in the Bogam-ri tombs of Baekje at Naju, South Jeolla Province in 2008.

Taegeuk - Wikipedia