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The letter X is widely used at the end of text messages and emails to signify a "Kiss". https://www.cyberdefinitions.com/definitions/X.html

That's funny, I've never seen it standalone, so I wouldn't have guessed. I'm used to "xoxo" for hugs and kisses.

It's just an informal way of ending a text, sort of signifies a kiss but used amongst friends and family

X = kiss, O = hug