The letter ‘x’ was first used to represent a kiss in 1763.

If you sign letters—or more likely, texts and emails—to those you love with an “xo,” then you’re keeping up a sweet tradition that goes back hundreds of years. Per an article in The Washington Post, the Oxford English Dictionary says that an “x” was first used to represent a kiss back in 1763 in a letter written by British naturalist Gilbert White.

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