A group of flags is commonly called a Flamboyance. Other collective nouns you may see include Stick and Flutter.
Collective nouns are unique terms used to refer to groups or collections of people, animals, or objects with a similar characteristic or purpose. When it comes to flags, there is no specific or widely recognized collective noun exclusively for flags as a group. However, a possible collective noun for a group of flags could be a "triumph" or an "array" of flags. A triumph of flags captures the essence of flags presented together as a symbol of victory, celebration, or triumph. It suggests a celebration of national identity, unity, or accomplishment where numerous flags are brought together to represent a collective purpose, triumph, or historical event. Alternatively, an array of flags evokes a sense of the visual and colorful display created by multiple flags side by side. It conveys the image of flags arranged systematically or artistically, forming an eye-catching collection. An array signifies the diversity and multitudes showcased through various national, cultural, or organizational flags embellishing an area or event. While these terms may not be universally established or accepted as collective nouns for flags, they offer a creative interpretation fitting the purpose and visual impact of seeing multiple flags displayed together. Remember, collective nouns often arise from common usage and can vary over time, so new suggestions may arise as language evolves.
Known collective nouns for Flags include: