This property defines the Unicodes which have Yi script
Characters like ꀀ,ꀁ,ꀂ, etc. are listed under Yi Script.
1220 Characters are present in Yi Script starting with the Unicode point U+A000 that represents the character ꀀ.
Currently, as per latest version 15.0.0, Unicode supports 164 number of Script. Here are a few examples - Adlam,Ahom,Anatolian Hieroglyphs, etc.