Literature Reference: 太极生两仪，两仪生四象。——《易经》 The Supreme Ultimate generates the Two Forms, and the Two Forms generate the Four Symbols. Source from 'The Book of Changes'.
极: Positive, North Pole. Originally referring to the main beam of a house, it later extended to mean the pinnacle, the highest point, and other similar connotations.
Meaning: The word 'Ji' signifies the ultimate pinnacle, representing perfection and the highest point.