The flag for Taiwan (officially Republic of China), which may show as the letters TW on some platforms.
This Taiwanese flag is hidden from the emoji keyboard on iOS devices when the region is set to China mainland or (as of iOS 13.1.2) Hong Kong or Macau.
Chinese-model iPhones will not display this emoji and will instead show a missing character tofu (☒) in place of the flag, as will iOS devices with region set to China mainland. Hong Kong and Macua only hide this emoji from the emoji keyboard.
The Flag: Taiwan emoji is a flag sequence combining 🇹 Regional Indicator Symbol Letter T and 🇼 Regional Indicator Symbol Letter W.
These display as a single emoji on supported platforms.