The Ethiopic Extended-B block spans U+1E7E0–U+1E7FF, 32 codepoints in Plane 1 (Supplementary Multilingual Plane). 28 are assigned in Unicode 16.0; the other 4 are reserved for future characters.
All of its characters belong to the Ethiopic script.
By general category: 28 other letters (Lo).
The first 28 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.