This is the flag of
🇬🇧 the British Indian Ocean Territory-Diego Garcia Island/Diego Island. Its background has horizontal blue and white wavy stripes and there is a British flag in upper left corner . At the bottom right is a palm tree with a golden crown
👑 strung on the trunk.It is displayed as DG on some platforms. Generally, it means Diego Garcia Island or within the territory of Diego Garcia.
🇩🇬 is the Emoji of a country/region‘s flag, and its meaning is flag: Diego Garcia. The Emoji 🇩🇬 is composed of two regional indicator letters, namely 🇩 and 🇬. The country/region's 2-letter code for Diego Garcia is DG, so the letters corresponding to the two region indicator letters are D and G. 🇩🇬 is displayed as a whole flag on most platforms and as a two-letter symbol on a few platforms.