The Tags block spans U+E0000–U+E007F, 128 codepoints in Plane 14 (Supplementary Special-purpose Plane). 97 are assigned in Unicode 16.0; the other 31 are reserved for future characters.
All of its characters have the script value Common: they are shared across writing systems rather than tied to one.
By general category: 97 format characters (Cf).
The first 97 arrived in Unicode 3.1 (2001).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.