This property defines the Unicodes which belongs to Braille Patterns block
Characters like ⠀,⠁,⠂, etc. are listed under Braille Patterns Block.
256 Characters are present in Braille Patterns Block starting with the Unicode point U+2800 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.