This property defines the Unicodes which belongs to Cham block
Characters like ꨀ,ꨁ,ꨂ, etc. are listed under Cham Block.
86 Characters are present in Cham Block starting with the Unicode point U+AA00 that represents the character ꨀ.
Currently, as per latest version 15.0.0, Unicode supports 328 number of Block. Here are a few examples - Latin Extended E,Adlam,Aegean Numbers, etc.