Cretan hieroglyphs
Cretan hieroglyphs is a writing system, used in Crete from about the 20th to the 15th century BC. It is undeciphered, so it cannot be read today. For most of its history, it was used together with Linear A. Most symbols are pictograms, for some symbols, experts do not agree on what they represent. Most of the corpus consists of short inscriptions on seal stones, and clay tablets.  The texts are usually very short, they are inscriptions on seals, and markers on clay tablets. There are three items that are noticeably different: A stone called Malia altar stone, the Phaistos Disc and the Arkalochori Axe. The exact relation of these items to the rest of the corpus is unknown.