The word for today is…
vexillology (noun):
: the study of flags
Source : Merriam -Webster
Etymology : Vexillologists undertake scholarly investigations of flags, producing papers with titles such as "A Review of the Changing Proportions of Rectangular Flags since Medieval Times, and Some Suggestions for the Future." In the late 1950s, they coined vexillology as a name for their field of research, basing it on vexillum, the Latin term for a square flag or banner of the ancient Roman cavalry. The adjectives vexillologic and vexillological and the noun vexillologist followed soon thereafter.
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