ㅎㅎ

Etymology
. Compare e.g. 🇨🇬.

Interjection

 * 1)  haha, lol;

Usage notes

 * has a softer and more polite tone than and is more commonly in somewhat formal contexts.
 * is more likely to be included "just for the sake of it" or to make the tone more friendly, whereas is more likely to represent actual laughter.
 * Unlike, it is rather uncommon to repeat more than three times.