Meaning
This flag stands for Clipperton Island, a small uninhabited coral atoll in the eastern Pacific that belongs to France. It has no flag of its own, so the French tricolour of blue, white and red represents it.
You will rarely need it outside geography quizzes, flag collections or chats about remote places and ocean expeditions. It works with 🏝️ or 🗺️ for trivia: “Bet you can’t find Clipperton on a map 🇨🇵🗺️”