The Georgian Extended block spans U+1C90–U+1CBF, 48 codepoints in Plane 0 (Basic Multilingual Plane). 46 are assigned in Unicode 16.0; the other 2 are reserved for future characters.
All of its characters belong to the Georgian script.
By general category: 46 uppercase letters (Lu).
The first 46 arrived in Unicode 11.0 (2018).