The Myanmar Extended-B block spans U+A9E0–U+A9FF, 32 codepoints in Plane 0 (Basic Multilingual Plane). 31 are assigned in Unicode 16.0; the other 1 are reserved for future characters.
All of its characters belong to the Myanmar script.
By general category: 19 other letters (Lo), 10 decimal digits (Nd), 1 non-spacing marks (Mn), 1 modifier letters (Lm).
The first 31 arrived in Unicode 7.0 (2014).