The Linear B Syllabary block spans U+10000–U+1007F, 128 codepoints in Plane 1 (Supplementary Multilingual Plane). 88 are assigned in Unicode 16.0; the other 40 are reserved for future characters.
All of its characters belong to the Linear B script.
By general category: 88 other letters (Lo).
The first 88 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.