This is the flag of
🇫🇷 French Southern Territory, with the dark blue as the background, the French flag in the upper left corner, and the badge of the territory on the right. Five white five-pointed stars surround the letters "TAAF" (Terres australes et antarctiques françaises). TF is displayed on some platform systems.
🇹🇫 is the Emoji of a country/region‘s flag, and its meaning is flag: French Southern Territories. The Emoji 🇹🇫 is composed of two regional indicator letters, namely 🇹 and 🇫. The country/region's 2-letter code for French Southern Territories is TF, so the letters corresponding to the two region indicator letters are T and F. 🇹🇫 is displayed as a whole flag on most platforms and as a two-letter symbol on a few platforms.