This property defines the Unicodes which belongs to Ethiopic Supplement block
Characters like ᎀ,ᎁ,ᎂ, etc. are listed under Ethiopic Supplement Block.
27 Characters are present in Ethiopic Supplement Block starting with the Unicode point U+1380 that represents the character ᎀ.
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.