There are two letters that people use at the end of intimate emails or letters, " XO, " you might see " XOXOXO" .
人们在亲密电子邮件或信件的末尾使用两个字母“XO”，您可能会看到“XOXOXO” 。
英语百科
Hugs and kisses
（重定向自XOXOXO）
Hugs and kisses or xoxo is a term used for expressing sincerity, faith, love, or good friendship at the end of a written letter, email or SMS text message. There is controversy as to which letter ('X' or 'O') represents which action ('hug' or 'kiss').