triad
noun uk/ˈtraɪ.æd/ us/ˈtraɪ.æd/
(CHINESE ORGANIZATION)
[ C ]三合会（从事贩毒等非法活动的中国秘密组织）
a secret Chinese organization involved in illegal activities such as selling drugs
(THREE THINGS)
[ S ] literary三位一体;三件一套
three related things that form a group
the classic triad of the visual arts: architecture, painting and sculpture 视觉艺术的传统三组合：建筑、绘画和雕塑