This is the flag of
🇬🇧 the British Overseas Territory of South Georgia and the South Sandwich Islands. The flag is blue, with the British flag in the upper left corner, and the emblem of the islands in the middle. It is displayed as GS on some platforms. It generally means South Georgia and the South Sandwich Islands or within the scope of South Georgia and the South Sandwich Islands.
🇬🇸 is the Emoji of a country/region‘s flag, and its meaning is flag: South Georgia & South Sandwich Islands. The Emoji 🇬🇸 is composed of two regional indicator letters, namely 🇬 and 🇸. The country/region's 2-letter code for South Georgia & South Sandwich Islands is GS, so the letters corresponding to the two region indicator letters are G and S. 🇬🇸 is displayed as a whole flag on most platforms and as a two-letter symbol on a few platforms.