This property defines the Unicodes which belongs to Devanagari block
Characters like ऀ,ँ,ं, etc. are listed under Devanagari Block.
128 Characters are present in Devanagari Block starting with the Unicode point U+0900 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.