In Pompeii, phallic symbols on local roadways pointed the way to the nearest brothel;

In Pompeii, phallic symbols on local roadways pointed the way to the nearest brothel; possibly to direct foreign sailors who didn't speak Latin.
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(TITLE FROM REDDIT r/interestingasfuck)

Also they bring luck :)
Following this, I suggest we start using yonic symbols to indicate lingerie stores and good fortune.