The term 'xo' is commonly used as a sign-off in messages, especially in letters or texts, indicating hugs and kisses. The 'x' represents kisses, and the 'o' represents hugs. It's often used to express affection, warmth, and closeness in a casual or informal way.
The origins of 'xo' can be traced back to the early 20th century. The 'x' representing a kiss dates back to the medieval period, where a kiss was often symbolized by an 'x' that denoted a signature in letters. Over time, 'xo' evolved to combine both hugs and kisses.