Eritrea

The flag of Eritrea emoji shows a red isosceles triangle with its base at the hoist, dividing the flag into two right triangles: green (top) and blue, with a gold olive wreath. On some systems, it is displayed as a flag, while on others, it may appear as letters ER. If someone sends you a 🇪🇷 emoji, they are referring to the country of Eritrea.