¤»¤»¤» (kkkk) is Hangul (the Korean
alphabet) for hehehe or just giggling in general.
Cyworld, the Korean Myspace, is full of this word on every page. It is also used in
instant messaging, similar to the use of LOL for English
conversation. It is also common to see ¤»¤»¤»zz (since the ¤» key is on the 'z' key.)