Block from U+10080 to U+100FF. This block was introduced in Unicode version 4.0 (2003). It contains 123 codepoints.
The Wikipedia provides the following information on block Linear B Ideograms:
Linear B Ideograms is a Unicode block containing ideographic characters for writing Mycenaean Greek. Several Linear B ideographs double as syllabic letters, and are encoded in the Linear B Syllabary block.