Hugs and kisses or xoxo is a term used for expressing affection or good friendship at the end of a written letter, email or SMS text message. Some sources discuss the possibility of "x" referring to kisses and "o" referring to hugs.[1][2] However, other sources indicate that "x" is used to signify a kiss and "o" is used to signify a hug.[3][4][5][6] The use of "x" to signify a kiss dates back to as early as 1990 .[3][7]