The flag for Ascension Island, which may show as the letters AC on some platforms. This same flag is used for St. Helena and Tristan Da Cunha.
The Flag: Ascension Island emoji is a sequence of the 🇦 Regional Indicator Symbol Letter A and 🇨 Regional Indicator Symbol Letter C emojis. These display as a single emoji on supported platforms.
Flag: Ascension Island was added to Emoji 1.0 in 2015.