I've just realised that at the end of the mail, my friend usually type triple x like this Xxx. Does anyone can explain to me what does it mean? i guess it has a same meaning like "love" or "regards".
and, 'xoxo' is it same as 'xxx'?
Maybe these kind of symbol is just the same meaning and function like kaomoji, (顔文字, literally “kao” means “face” and “moji”, “letter”), such as: (＾∇＾) (ヾ(´･ω･｀) (T_T) (。・_・。)ノ （￣～￣;）
(･_･?) (◎^ω^◎) （＾▼≦ゞ） f^_^ (*・_・)ノ⌒* (;´ρ`) source: http://kicainc.jp/ronbun/2007ron/shintani.html