A group of unicorns is called a blessing. A collective noun is a naming word for a group of animals, people, and things. There are very unusual names for a group of animals, and unicorns, no matter their mythical status, are no different. Juliana Berners authored The Boke of St. Albans, a treatise on hawking, hunting, and heraldry, in 1486. She included in her book a listing of collective nouns for both animals and people. She noted a collection of kittens to be a kindle, while a group of cats is a clowder. Since her publication, a group of wild cats has been called a destruction. The other two collective nouns in our answer group are a thunder of dragons and a dazzle of zebras.