The Tamil block spans U+0B80–U+0BFF, 128 codepoints in Plane 0 (Basic Multilingual Plane). 72 are assigned in Unicode 16.0; the other 56 are reserved for future characters.
All of its characters belong to the Tamil script.
By general category: 37 other letters (Lo), 11 spacing marks (Mc), 10 decimal digits (Nd), 7 other symbols (So), 3 non-spacing marks (Mn), plus smaller groups.
The first 61 arrived in Unicode 1.1 (1993); later additions came in 4.0 (8), 4.1 (2), 5.1 (1).