The Tai Tham block spans U+1A20–U+1AAF, 144 codepoints in Plane 0 (Basic Multilingual Plane). 127 are assigned in Unicode 16.0; the other 17 are reserved for future characters.
All of its characters belong to the Tai Tham script.
By general category: 53 other letters (Lo), 29 non-spacing marks (Mn), 20 decimal digits (Nd), 13 other punctuation (Po), 11 spacing marks (Mc), plus smaller groups.
The first 127 arrived in Unicode 5.2 (2009).