The Anatolian Hieroglyphs block spans U+14400–U+1467F, 640 codepoints in Plane 1 (Supplementary Multilingual Plane). 583 are assigned in Unicode 16.0; the other 57 are reserved for future characters.
All of its characters belong to the Anatolian Hieroglyphs script.
By general category: 583 other letters (Lo).
The first 583 arrived in Unicode 8.0 (2015).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.