Phaistos disc key ring

The Phaistos Disc (also spelled Phaistos Disc, Phaestos Disc) is a disc of fired clay from the Minoan palace of Phaistos, possibly dating to the middle or late Minoan Bronze Age (2nd millennium BC). It is about 15 cm (5.9 in) in diameter and covered on both sides with a spiral of stamped symbols. Its purpose and meaning, and even its original geographical place of manufacture, remain disputed, making it one of the most famous mysteries of archaeology. This unique object is now on display at the archaeological museum of Heraklion in Crete, Greece.