This property defines the Unicodes which belongs to Sinhala block
Characters like ඁ,ං,ඃ, etc. are listed under Sinhala Block.
104 Characters are present in Sinhala Block starting with the Unicode point U+0D81 that represents the character ඁ.
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.