This property defines the Unicodes which belongs to Old Uyghur block
Characters like 𐽰,𐽱,𐽲, etc. are listed under Old Uyghur Block.
27 Characters are present in Old Uyghur Block starting with the Unicode point U+10F70 that represents the character 𐽰.
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.