Why x stands for kisses in xoxo?

The "x" in "xoxo" represents kisses, and its usage can be traced back to the practice of signing letters with an "X" to symbolize a kiss. This tradition likely originated in medieval times when people would sign documents with an "X" as a mark of sincerity, often kissing the mark to show their authenticity. Over time, the "x" became widely recognized as a symbol of affection, leading to its association with kisses in the popular expression "xoxo," which conveys love and warmth.