Answer :
Dyad (group of two): The dyad is the most intimate form of social life because the two members are mutually dependent on each other. If one member leaves the group, the group ceases to exist. A triad (group of three).
The Triad refers to the three centers that dominated the world economy until the late 1990s: the United States (US), the European Union (EU), and Japan (JP). Or, more broadly, North America, (Western) Europe, and Japan. But why is the word "triad" used? According to sources (see below), the term is a relatively modern term for this organization. British authorities in Hong Kong are said to have coined the term in reference to the triangular symbol repeatedly used by gangs.
The Triad is a Chinese transnational organized crime syndicate based in Greater China. , with outposts in various countries and a significant overseas Chinese population. The Hong Kong Triad is distinct from mainland China's criminal gangs.
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