Meaning
This flag stands for Diego Garcia, a coral atoll in the Chagos Archipelago in the central Indian Ocean. A separate flag emoji exists for the British Indian Ocean Territory, which covers the same island group.
It is rarely used in everyday chat and shows up mainly in geography quizzes, flag collections and conversations about remote atolls, often with 🏝️ or 🗺️. “Tonight’s hardest quiz question: where is Diego Garcia 🇩🇬🗺️”