The regional indicator symbols are a set of 26 alphabetic Unicode characters (A–Z) intended to be used to encode ISO 3166-1 alpha-2 two-letter country codes in a way that allows optional special treatment.
[15] In 2007 a draft proposal was presented to the Unicode Technical Committee to encode emoji symbols, specifically those in widespread use on mobile phones by Japanese telecommunications companies DoCoMo, KDDI, and SoftBank.
[16] The proposed symbols included ten national flags:[17] China (🇨🇳), Germany (🇩🇪), Spain (🇪🇸), France (🇫🇷), the UK (🇬🇧), Italy (🇮🇹), Japan (🇯🇵), South Korea (🇰🇷), Russia (🇷🇺), and the United States (🇺🇸).
They would represent political entities based on ISO 3166 such as "JP" for Japan or Internet ccTLDs (country code top-level domains) such as "EU" for the European Union.
[2] Per the Unicode Standard "the main purpose of such [regional indicator symbol] pairs is to provide unambiguous roundtrip mappings to certain characters used in the emoji core sets"[21] specifically the ten national flags:[22] 🇨🇳, 🇩🇪, 🇪🇸, 🇫🇷, 🇬🇧, 🇮🇹, 🇯🇵, 🇰🇷, 🇷🇺, and 🇺🇸.