The word vexillology is a synthesis of the Latin word "vexillum" and the suffix "-logy" which is used in the names of other sciences (biology, geology, sociology, psychology...). See List_of_ologies.
Vexillologists are active in several national associations under the umbrella of FIAV (Fédération Internationale des Associations Vexillologiques). Every year, FIAV organizes an international congress of vexillology (ICV 2003 was in Stockholm, Sweden). Internet activity of vexillologists centers around the Flags of the World (FOTW) Website and mailing list.