Sample from full article at https://preply.com/en/d/laughing-around-the-world-map--lp
1 - Thai: "55555" is the most curious graphic representation and the reason behind it is because the number 5 in Thai is pronounced "haa". To laugh a lot you will see 55555555+(+) adding the "+" sign.
2 - Portuguese: In both Portugal and Brazil, laughter is written "kkkkk" but you will also find "rsrsrs" (abbreviation of "riso", meaning "laughter") and the ironic "rarara".
3 - Turkish: "hahaha", "ahahah", "jsjsjsjs", "weqeqwqewqew" or, the funniest option, random letters like: "dksajdksajdoşad" (which is the most common) are used to laugh.