vexillology
Academic study of flags, their history, symbolism, and design. A specialized term; the cross-reference 旗章 refers to flags and banners.
See also: 旗章
He is an expert in vexillology and is knowledgeable about national flags around the world.
Compound of 旗章 (flags and banners) + 学 (study, -ology). The term is a modern academic coinage corresponding to English 'vexillology'.