The Mongolian Supplement block spans U+11660–U+1167F, 32 codepoints in Plane 1 (Supplementary Multilingual Plane). 13 are assigned in Unicode 16.0; the other 19 are reserved for future characters.
All of its characters belong to the Mongolian script.
By general category: 13 other punctuation (Po).
The first 13 arrived in Unicode 9.0 (2016).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.