The Old North Arabian block spans U+10A80–U+10A9F, 32 codepoints in Plane 1 (Supplementary Multilingual Plane). Every one of them is assigned in Unicode 16.0.
All of its characters belong to the Old North Arabian script.
By general category: 29 other letters (Lo), 3 other numbers (No).
The first 32 arrived in Unicode 7.0 (2014).
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.