This property defines the Unicodes which belongs to Tai Tham block
Characters like ᨠ,ᨡ,ᨢ, etc. are listed under Tai Tham Block.
132 Characters are present in Tai Tham Block starting with the Unicode point U+1A20 that represents the character ᨠ.
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.