This property defines the Unicodes which are non spacing mark that extends a previous base character
Characters like ̀,́,̂, etc. are listed under Exclamation Grapheme Cluster Break.
2130 Characters are present in Exclamation Grapheme Cluster Break starting with the Unicode point U+0300 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.