Researchers have shown that mysterious symbols carved in ancient Pictish stones are not just pictures but a forgotten written language.
The Picts were an Iron Age society who lived in northern Britain from AD 300-800. Although there are only about 250 Pictish stones still in existence, the researchers used mathematics to identify distinctive patterns that show the symbols are almost certainly writing.
According to the Royal Society: "This new method opens up the possibility that other ancient inscriptions could be similarly analysed, paving the way to vastly improved interpretation of many ancient languages that were previously thought undecipherable."
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