육근 (六根) (내계 (內界)), 육경 (六境) (외계 (外界)), 육식 (六識) (중계 (中界))을 말함. 이들에 대한 보다 자세한 설명은 별도 각 항목 참조)

The eighteen realms, spheres or fields: 1) (Yukgeun) Six roots or sense organs (the component part of personality). 2) (Yukgyeong) Six sense-objects or spheres of sense (the factors of consciousness). 3) (Yuksik) Six cognitions or perceptions (the intermediate agent). See each entry for further detail.