The Byblos syllabary, also known as the Pseudo-hieroglyphic script, Proto-Byblian, Proto-Byblic, or Byblic, is officially an undeciphered writing system, known from ten inscriptions found in [https://en.wikipedia.org/wiki/Byblos Byblos0. The inscriptions are engraved on bronze plates and spatulas, and carved in stone. They were excavated by Maurice Dunand, from 1928 to 1932, and published in 1945 in his monograph Byblia Grammata. The inscriptions are conventionally dated to the second millennium BC, probably between the 18th and 15th centuries BC.
Examples of the script have also been discovered in Egypt, Italy, and Megiddo (Garbini, Colless).
More information on the Wikipedia page .
A bibliography is here