Important Symbols presents an extensive compilation of the symbols of ancient cultures, describing the context and usage of each symbol around the world and throughout time. Adelaide Hall groups the symbols into categories, each comprising a chapter of the book. Chapters including "The Halo and the Crown," "Fabulous Creatures," "Architectural Forms," "Military Emblems," "Plants and Blossoms," "Angelic Personages," "Animals," and more open with short explanations and include dictionary style listings of symbols and their meanings.