Linear B is a script that was used for writing Mycenaean, an early form of Greek. It predated the Greek alphabet by several centuries and seems to have died out with the fall of Mycenaean civilization. Most of the tablets inscribed in Linear B were found in Knossos, Cydonia, Pylos, Thebes and Mycenae. The succeeding period, known as the Greek Dark Ages, provides no evidence of the use of writing.
The script appears to be related to Linear A, an undeciphered earlier script used for writing the Minoan language, and the later Cypriot syllabary, which recorded Greek. Linear B consists of around 87 syllabic signs and a large repertory of semantographic signs. These “signifying” signs stand for objects or commodities, but do not have phonetic value and are never used as word signs in writing a sentence.
The application of Linear B was confined to administrative contexts. In all the thousands of 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). From this fact it could be theorized that the script was used only by some sort of guild of professional scribes who served the central palaces. Once the palaces were destroyed, the script disappeared.