The Phaistos Disc is a very old object that was discovered in Crete, which is an island in Greece. It is round and made of clay, and it has lots of symbols or pictures all over it.
People have been trying to understand the Phaistos Disc for a really long time, but it's still a bit of a mystery. Experts think that it might be a calendar or map, but nobody is exactly sure what it was used for or even what the symbols mean.
The disc was made in the Bronze Age, which is a very long time ago, even before your mom and dad were born! We know this because it was found in a palace that was built way back then.
Even though we don't know exactly what the Phaistos Disc means, it is still very cool to look at and people all over the world find it fascinating!