U+1003F Linear B Syllable B020 Zo

The Wikipedia has the following information about this codepoint:

Linear B was a syllabic script that was used for writing Mycenaean Greek, the earliest attested form of Greek. The script predates the Greek alphabet by several centuries. The oldest Mycenaean writing dates to about 1400 BC. It is descended from the older Linear A, an undeciphered earlier script used for writing the Minoan language, as is the later Cypriot syllabary, which also recorded Greek. Linear B, found mainly in the palace archives at Knossos, Cydonia, Pylos, Thebes and Mycenae, disappeared with the fall of Mycenaean civilization during the Late Bronze Age collapse. The succeeding period, known as the Greek Dark Ages, provides no evidence of the use of writing. Linear B, deciphered by English architect and self-taught linguist Michael Ventris—based on the research of American classicist Alice Kober—is the only Bronze Age Aegean script to have thus far been deciphered.

Linear B consists of around 87 syllabic signs and over 100 ideographic signs. These ideograms or "signifying" signs symbolize objects or commodities. They have no phonetic value and are never used as word signs in writing a sentence.

The application of Linear B appears to have been confined to administrative contexts. In all the thousands of clay tablets, a relatively small number of different "hands" have been detected: 45 in Pylos (west coast of the Peloponnese, in southern Greece) and 66 in Knossos (Crete). Once the palaces were destroyed, the script disappeared.