This property defines the Unicodes which belongs to Grantha block
Characters like 𑌀,𑌁,𑌂, etc. are listed under Grantha Block.
101 Characters are present in Grantha Block starting with the Unicode point U+11300 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.