This property defines the Unicodes which belongs to Variation Selectors Supplement block
Characters like 󠄀,󠄁,󠄂, etc. are listed under Variation Selectors Supplement Block.
240 Characters are present in Variation Selectors Supplement Block starting with the Unicode point U+E0100 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.