The Linear B Ideograms block spans U+10080–U+100FF, 128 codepoints in Plane 1 (Supplementary Multilingual Plane). 123 are assigned in Unicode 16.0; the other 5 are reserved for future characters.
All of its characters belong to the Linear B script.
By general category: 123 other letters (Lo).
The first 123 arrived in Unicode 4.0 (2003).
Because it lies outside the BMP, every character here takes four bytes in UTF-8 and a surrogate pair in UTF-16.