triad
tri-ad
noun
A secret criminal organisation, especially one of Chinese origin.
"Police are investigating the local triad's illegal activities."
noun
A group or set of three related people or things.
"The holy triad represents three divine persons."
Thesaurus
Synonyms: threesome, triplet, troika, tercet, three, deuce-ace, trinity, III, tierce, trine, 3, ternary