* "ha ha"
* "hehe"
* "lol"
* "hahaha"
* "tee hee"
* "ho ho ho"
* "snicker"
* "chuckle"
* "guffaw"
You can also use punctuation to represent laughter, like:
* "Ha!"
* "Hahaha!"
* "Hee hee..."
The best way to spell a laugh depends on the context and the type of laughter you want to convey.