This property defines the Unicodes which belongs to Supplemental Arrows A block
Characters like ⟰,⟱,⟲, etc. are listed under Supplemental Arrows A Block.
16 Characters are present in Supplemental Arrows A Block starting with the Unicode point U+27F0 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.