The flag for Christmas Island, which may show as the letters CX on some platforms.
The Flag: Christmas Island emoji is a flag sequence combining ? Regional Indicator Symbol Letter C and ? Regional Indicator Symbol Letter X. These display as a single emoji on supported platforms.
Flag: Christmas Island was added to Emoji 1.0 in 2015.
U+1F1E8
U+1F1FD
?? Regional indicator symbol letter c
?? Regional indicator symbol letter x