The conversation between human and AI assistant.
[|Human|] What is the study of flags called?
[|AI|] The Study of Flags Is Called Vexillology. Vexillology as a word is derived from the Latin vexillum, a term used by the Romans to refer to a kind of standard with a fabric hung from a horizontal crossbar on a pole. It is the nearest equivalent in the classical languages to what we call a flag today.
[|Human|] 
What is the study of flags called?