This property defines the Unicodes which have Cyrillic script
Characters like Ѐ,Ё,Ђ, etc. are listed under Cyrillic Script.
506 Characters are present in Cyrillic Script starting with the Unicode point U+0400 that represents the character Ѐ.
Currently, as per latest version 15.0.0, Unicode supports 164 number of Script. Here are a few examples - Adlam,Ahom,Anatolian Hieroglyphs, etc.