Sator skull

Wikipedia: The Sator Square (or Rotas-Sator Square or Templar Magic Square ) is a two-dimensional acrostic class of word square containing a five-word Latin palindrome . The earliest squares were found at Roman-era sites, all in ROTAS-form (where the top line is "ROTAS", not "SATOR"), with the earliest discovery at Pompeii (and also likely pre-AD 62). The earliest square with Christian-associated imagery dates from the sixth century. By the Middle Ages , Sator squares had been found across Europe , Asia Minor , and North Africa . In 2022, the Encyclopedia Britannica called it "the most familiar lettered square in the Western world".