The Old Uyghur block spans U+10F70–U+10FAF, 64 codepoints in Plane 1 (Supplementary Multilingual Plane). 26 are assigned in Unicode 16.0; the other 38 are reserved for future characters.
All of its characters belong to the Old Uyghur script.
By general category: 18 other letters (Lo), 4 non-spacing marks (Mn), 4 other punctuation (Po).
The first 26 arrived in Unicode 14.0 (2021).
Most letters here are written right to left. See bidirectional text.
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.