The flag for Mauritania, which may show as the letters MR on some platforms. This design changed in August 2017, adding a red band at the top and bottom.
Only newer vendor updates display the new flag design.
The Flag: Mauritania emoji is a sequence of the 🇲 Regional Indicator Symbol Letter M and 🇷 Regional Indicator Symbol Letter R emojis. These display as a single emoji on supported platforms.
Flag: Mauritania was added to Emoji 1.0 in 2015.