There are two things we can tell you with absolute certainty about the Phaistos Disc. The first is that it's incredibly beautiful. The second is that nobody knows what it means.
The disc, which was found in a Minoan palace in Crete, is approximately 3800 years old. There are 241 different symbols on the clay disc, and none of them are connected to any language we're aware of. Experts think it may have religious connotations, and might even be a hymn or a prayer.