The Unified Canadian Aboriginal Syllabics Extended block spans U+18B0–U+18FF, 80 codepoints in Plane 0 (Basic Multilingual Plane). 70 are assigned in Unicode 16.0; the other 10 are reserved for future characters.
All of its characters belong to the Canadian Aboriginal script.
By general category: 70 other letters (Lo).
The first 70 arrived in Unicode 5.2 (2009).