Multiple choice general knowledge science & technology The study of flags is called: Felinology Foetology Vexillology Rheology Reveal answer Fill a bubble to check yourself C Correct answer Explanation Vexillology is the study of flags, flag design, and their history. The term comes from Latin 'vexillum' meaning flag. Felinology is the study of cats, foetology (misspelled fetology) relates to fetal study, and rheology studies fluid flow.