This property defines the Unicodes which belongs to Block Elements block
Characters like ▀,▁,▂, etc. are listed under Block Elements Block.
32 Characters are present in Block Elements Block starting with the Unicode point U+2580 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.