Vexillology (/ˌvɛksɪˈlɒlədʒi/ VEK-sih-LOL-ə-jee) is the study of the history, symbolism and usage of flags or, by extension, any interest in flags in general.[1]
A person who studies flags is a vexillologist, one who designs flags is a vexillographer, and the art of designing flags is called vexillography. One who is a hobbyist or general admirer of flags is a vexillophile.