The Tai Xuan Jing Symbols block spans U+1D300–U+1D35F, 96 codepoints in Plane 1 (Supplementary Multilingual Plane). 87 are assigned in Unicode 16.0; the other 9 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: 87 other symbols (So).
The first 87 arrived in Unicode 4.0 (2003).
87 characters are East Asian Wide or Fullwidth and take two columns in terminals.
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.