VEXILLOLOGY:  The scientific study of the history, symbolism, and usage of flags or, by extension, any interest in flags in general.

Whitney Smith, Through the Ages and Across the World, 1975

The North American Vexillological Association, the largest organization of flag enthusiasts and scholars in the world, has promoted excellence in vexillology and camaraderie among those interested in flags. Over 800 members belong to NAVA, across most states and provinces in the U.S. and Canada and more than 25 other countries.