This property defines the Unicodes which belongs to Tai Viet block
Characters like ꪀ,ꪁ,ꪂ, etc. are listed under Tai Viet Block.
73 Characters are present in Tai Viet Block starting with the Unicode point U+AA80 that represents the character ꪀ.
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.