(graph theory) An undirected graph with 2n vertices in the two sets { u₁, u₂, ..., uₙ } and { v₁, v₂, ..., vₙ } and with an edge from uᵢ to vⱼ whenever i ≠ j.

A surname.

(video games) In some roguelike games, a type of fictional invisible monster that summons other monsters.

One who rejoices.