The Toto block spans U+1E290–U+1E2BF, 48 codepoints in Plane 1 (Supplementary Multilingual Plane). 31 are assigned in Unicode 16.0; the other 17 are reserved for future characters.
All of its characters belong to the Toto script.
By general category: 30 other letters (Lo), 1 non-spacing marks (Mn).
The first 31 arrived in Unicode 14.0 (2021).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.