Tag Sequence
Technical/UnicodeEmoji flag sequences using special tag characters (U+E0020 to U+E007E) to represent subdivision flags like England, Scotland, and Wales.
While country flags use Regional Indicator pairs, subdivision flags (states, provinces, regions) use a different mechanism: tag sequences. These start with the black flag emoji (🏴 U+1F3F4), followed by tag characters spelling out an ISO 3166-2 code, and end with the cancel tag (U+E007F).For example, 🏴 (England) is: 🏴 + tag-g + tag-b + tag-e + tag-n + tag-g + cancel tag. The tag characters are invisible and exist solely for this encoding purpose.
Currently only three subdivision flags are in widespread use: England (gbeng), Scotland (gbsct), and Wales (gbwls), though the mechanism supports any ISO 3166-2 code.