a membership organization devoted to vexillology, the study of flags.

Vexillological symbols are used by vexillologists to indicate certain characteristics of flags, such as where they are used, who uses them, and what they look like.

an international federation of 53 regional, national, and multinational associations and institutions across the globe that study vexillology, which FIAV defines in its constitution as "the creation and development of a body of knowledge about flags of all types, their forms and functions, and of scientific theories and principles based on that knowledge."