The term "18족" refers to the "18 clans" in Korean history, which were prominent families or lineages during the Goryeo and Joseon dynasties. These clans played a significant role in the political and social structure of Korea, often holding power and influence over various regions. Each clan had its own unique characteristics and contributions to Korean culture and governance. The 18 clans were known for their distinct family names and ancestral roots, which often traced back to notable historical figures. They contributed to the development of the Korean aristocracy and were involved in various aspects of governance, education, and military affairs, shaping the course of Korean history during their prominence.