The flag for Macau, which may show as the letters MO on some platforms.
The Flag: Macao Sar China emoji is a flag sequence combining ? Regional Indicator Symbol Letter M and ? Regional Indicator Symbol Letter O. These display as a single emoji on supported platforms.
Flag: Macao Sar China was added to Emoji 1.0 in 2015.
U+1F1F2
U+1F1F4
?? Regional indicator symbol letter m
?? Regional indicator symbol letter o