This is
🇳🇿 the flag of Tokelau, the territory of New Zealand. The flag has a dark blue background and four white five-pointed stars
⭐️ on the left. A yellow triangle resembling a sail extends from the bottom to the upper right. TK is displayed on some platforms.
🇹🇰 is the Emoji of a country/region‘s flag, and its meaning is flag: Tokelau. The Emoji 🇹🇰 is composed of two regional indicator letters, namely 🇹 and 🇰. The country/region's 2-letter code for Tokelau is TK, so the letters corresponding to the two region indicator letters are T and K. 🇹🇰 is displayed as a whole flag on most platforms and as a two-letter symbol on a few platforms.