The Soyombo block spans U+11A50–U+11AAF, 96 codepoints in Plane 1 (Supplementary Multilingual Plane). 83 are assigned in Unicode 16.0; the other 13 are reserved for future characters.
All of its characters belong to the Soyombo script.
By general category: 48 other letters (Lo), 24 non-spacing marks (Mn), 8 other punctuation (Po), 3 spacing marks (Mc).
The first 80 arrived in Unicode 10.0 (2017); later additions came in 11.0 (1), 12.0 (2).
Most characters here are combining marks. See combining diacritical marks.
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.