This property defines the Unicodes which belongs to Hiragana block
Characters like ぁ,あ,ぃ, etc. are listed under Hiragana Block.
95 Characters are present in Hiragana Block starting with the Unicode point U+3041 that represents the character ぁ.
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.