Vexillology is the study of flags; the name for this field comes from the Latin “vexillum,” meaning “flag, military ensign, banner.” “Vexillology” originally comes from “velum,” meaning “a sail, curtain, veil.” The North American Vexillological Association promotes itself as “the world’s largest organization of flag enthusiasts and scholars.” The group published “Good Flag, Bad Flag,” a booklet that proposes five basic principles for good flag design: Keep it simple, use meaningful symbolism, use two or three basic colors, no lettering or seals, and be distinctive or be related.