The Old Italic block spans U+10300–U+1032F, 48 codepoints in Plane 1 (Supplementary Multilingual Plane). 39 are assigned in Unicode 16.0; the other 9 are reserved for future characters.
All of its characters belong to the Old Italic script.
By general category: 35 other letters (Lo), 4 other numbers (No).
The first 35 arrived in Unicode 3.1 (2001); later additions came in 7.0 (1), 10.0 (3).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.