The Egyptian Hieroglyph Format Controls block spans U+13430–U+1345F, 48 codepoints in Plane 1 (Supplementary Multilingual Plane). 38 are assigned in Unicode 16.0; the other 10 are reserved for future characters.
All of its characters belong to the Egyptian Hieroglyphs script.
By general category: 16 format characters (Cf), 16 non-spacing marks (Mn), 6 other letters (Lo).
The first 9 arrived in Unicode 12.0 (2019); later additions came in 15.0 (29).
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.