This property defines the Unicodes which belongs to Variation Selectors block
Characters like ︀,︁,︂, etc. are listed under Variation Selectors Block.
16 Characters are present in Variation Selectors Block starting with the Unicode point U+FE00 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.