The Sator Square is a word square or grid of five five-letter words (sator, arepo, tenet, opera, and rotas). It has existed since 62 AD and has been found all over Europe, the Middle East, Asia minor and North Africa. However, nobody knows its real meaning or origin. It could also be an early meme. It was also featured in the worst movie ever made by mankind, Christopher Nolan's Tenet.

Useless Facts, Badly Drawn #481: The Sator Square.
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