The Miao block spans U+16F00–U+16F9F, 160 codepoints in Plane 1 (Supplementary Multilingual Plane). 149 are assigned in Unicode 16.0; the other 11 are reserved for future characters.
All of its characters belong to the Miao script.
By general category: 76 other letters (Lo), 55 spacing marks (Mc), 13 modifier letters (Lm), 5 non-spacing marks (Mn).
The first 133 arrived in Unicode 6.1 (2012); later additions came in 12.0 (16).
Most characters here are combining marks. See combining diacritical marks.
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.