This is the flag of the Republic of Cuba. The flag is made up of five blue and white stripes as the bottom. On the left side, there is a red equilateral triangle and a white five-pointed star
⭐️, which is displayed on some platforms as CU. It generally means Cuba or within Cuba, and its capital is Havana.
🇨🇺 is the Emoji of a country/region‘s flag, and its meaning is flag: Cuba. The Emoji 🇨🇺 is composed of two regional indicator letters, namely 🇨 and 🇺. The country/region's 2-letter code for Cuba is CU, so the letters corresponding to the two region indicator letters are C and U. 🇨🇺 is displayed as a whole flag on most platforms and as a two-letter symbol on a few platforms.