This property defines the Unicodes which belongs to Syriac Supplement block
Characters like ࡠ,ࡡ,ࡢ, etc. are listed under Syriac Supplement Block.
12 Characters are present in Syriac Supplement Block starting with the Unicode point U+0860 that represents the character ࡠ.
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.