A Clique, Click

1. A small, exclusive group of individuals, usually according to lifestyle or social status; a cabal. Clique - Wikipedia
2. (graph theory) A subgraph isomorphic to a complete graph. Clique (graph theory) - Wikipedia
3. (Internet) A group of related web sites that link to each other, like a webring but with exclusive membership determined by the clique owner.

Synonyms

• (small, exclusive group): coterie, inner circle, camp

Antonyms

• (graph theory): independent set