This property defines the Unicodes which belongs to Syloti Nagri block
Characters like ꠀ,ꠁ,ꠂ, etc. are listed under Syloti Nagri Block.
46 Characters are present in Syloti Nagri Block starting with the Unicode point U+A800 that represents the character ꠀ.
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.