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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 code]]s in a way that allows optional special treatment.
These were defined in <time>October 2010</time> as part of the [[Unicode#6.0|Unicode 6.0]] support for [[emoji]], as an alternative to encoding separate characters for each country flag. Although they can be displayed as Roman letters, it is intended that implementations may choose to display them in other ways, such as by using [[national flag]]s.<ref>{{cite web|url=http://babelstone.blogspot.com/2009/11/whats-new-in-unicode-60.html|title=What's new in Unicode 6.0|author=[[Andrew West (linguist)|Andrew West]]|publisher=Babelstone|access-date=2014-08-18|archive-date=2014-04-06|archive-url=https://web.archive.org/web/20140406061417/http://babelstone.blogspot.com/2009/11/whats-new-in-unicode-60.html|url-status=dead}}</ref><ref name=n3727>{{cite web|url=https://www.unicode.org/L2/L2009/09379-n3727-regionalindicators.pdf|title=N3727: Proposal to encode Regional Indicator Symbols in the UCS|author=[[Michael Everson]] and Ken Whistler|publisher=Working Group Document, ISO/IEC JTC1/SC2/WG2 and UTC|access-date=2014-08-18}}</ref> The Unicode FAQ indicates that this mechanism should be used and that symbols for national flags will not be directly encoded.<ref>{{cite web | title = Unicode FAQ: Emoji and Dingbats | publisher = The Unicode Consortium | url = https://www.unicode.org/faq/emoji_dingbats.html | date = 2009-10-28 | access-date = 2014-08-18}}</ref>
They are encoded in the range {{unichar|1F1E6|regional indicator symbol letter a|html=}} to {{unichar|1F1FF|regional indicator symbol letter z|html=}} within the [[Enclosed Alphanumeric Supplement]] block in the [[Supplementary Multilingual Plane]].<ref>{{cite web|url=http://unicode.org/charts/PDF/Unicode-6.0/U60-1F100.pdf|title=Enclosed Alphanumeric Supplement, Range 1F100 - 1F1FF, The Unicode Standard, Version 6.0|publisher=Unicode Consortium|date=2010|access-date=2014-08-18}}</ref>
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Out of the 676 possible pairs of regional indicator symbols (26 × 26), only 270 are considered valid Unicode region codes.
These are a subset of the region sequences in the [[Common Locale Data Repository]] (CLDR):<ref name="UTR51Flags"/><ref>{{cite web |title=UTR #35: Unicode Locale Data Markup Language (LDML), Validity Data |publisher=Unicode Consortium |url=https://unicode.org/reports/tr35/#Validity_Data}}</ref><ref>{{cite web |title=CLDR v38 Region Validity Data |work=Unicode Common Locale Data Repository (CLDR) |url=https://unicode.org/cldr/latest/common/validity/region.xml |date=2020-10-28 }}{{Dead link|date=March 2022 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
* All 256 regular region sequences in the CLDR
** 249 officially assigned ISO 3166-1 alpha-2 codes
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! colspan="2" | deprecated !! colspan="4" | replacement<ref>{{Cite web|url=https://unicode.org/reports/tr35/tr35-info.html#Appendix_Supplemental_Metadata|title=UTR #35: Unicode Locale Data Markup Language (LDML), Supplemental Metadata|publisher=Unicode Consortium}}</ref><ref>{{cite web|url=https://unicode.org/cldr/latest/common/supplemental/supplementalMetadata.xml|title=CLDR v38 Supplemental Metadata
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! code !! region !! flag !! code !! region || [[commons:Category:Emoji One v1|possible rendering]]
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