The term commonly used to describe a group of sharks is a "shoal" or a "school" of sharks. Both terms are used interchangeably and refer to a gathering or aggregation of sharks swimming together. The collective term emphasizes the social behavior of sharks when they come together in the same area, often for feeding, migration, or mating purposes. It's worth noting that not all shark species exhibit schooling behavior, but when they do, a shoal or school is the appropriate terminology to describe their collective presence.