This property defines the Unicodes which belongs to Supplemental Arrows B block
Characters like ⤀,⤁,⤂, etc. are listed under Supplemental Arrows B Block.
128 Characters are present in Supplemental Arrows B Block starting with the Unicode point U+2900 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.