This property defines the Unicodes which belongs to Box Drawing block
Characters like ─,━,│, etc. are listed under Box Drawing Block.
128 Characters are present in Box Drawing Block starting with the Unicode point U+2500 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.