The Ancient Symbols block spans U+10190–U+101CF, 64 codepoints in Plane 1 (Supplementary Multilingual Plane). 14 are assigned in Unicode 16.0; the other 50 are reserved for future characters.
By script: Common (13), Greek (1).
By general category: 14 other symbols (So).
The first 12 arrived in Unicode 5.1 (2008); later additions came in 7.0 (1), 13.0 (1).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.