The Unified Canadian Aboriginal Syllabics Extended-A block spans U+11AB0–U+11ABF, 16 codepoints in Plane 1 (Supplementary Multilingual Plane). Every one of them is assigned in Unicode 16.0.
All of its characters belong to the Canadian Aboriginal script.
By general category: 16 other letters (Lo).
The first 16 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.