Vexilogy, as defined by the Flag Institute, is "the scientific study of flags and related emblems. It is concerned with research into flags of all kinds, both modern and historical, the creation of a body of practice for flag design and usage, and of a body of theory of flag development".
The North American Vexillological Association identified five core principals to creating a successful flag, which are: 1. Keep it simple; 2. Use meaningful symbolism; 3. Use two to three basic colors; 4. No lettering or seals; and 5. Be distinctive or be related.