This property defines the Unicodes which are regional indicator symbols indicating a potential cluster boundary between them
Characters like 🇦,🇧,🇨, etc. are listed under Regional Indicator Grapheme Cluster Break.
26 Characters are present in Regional Indicator Grapheme Cluster Break starting with the Unicode point U+1F1E6 that represents the character 🇦.
Currently, as per latest version 15.0.0, Unicode supports 14 number of Grapheme Cluster Break. Here are a few examples - Base,Carriage Return,Control Neutral, etc.