what is a group of ravens called

A group of ravens can be called by several different names, including an unkindness, a rave, a conspiracy, a treachery, or simply a flock. The most commonly used term is "unkindness," but the other terms are also in use. The collective noun "unkindness" may have originated from the association of ravens with death and bad omens, leading to a perception of them as unkind or sinister birds