The flag of South Korea, also known as Taegeukgi, has a rectangular shape with an aspect ratio of 2:3. The background is white, and the center of the flag features a blue circle containing a red and blue yin-yang symbol (Taegeuk) surrounded by four black trigrams, one in each corner. The exact measurements of the flag vary depending on its size, but the Taegeuk symbol should be centered both vertically and horizontally. The colors used in the flag are defined by the Pantone Matching System (PMS) as follows: Blue PMS 286C, Red PMS 186C, Black PMS Black C, and White.