Unicode's "Han Unification" https://en.wikipedia.org/wiki/Han_unification https://en.wikipedia.org/wiki/Han_unification aimed to create a unified character set

Unicode's "Han Unification" https://en.wikipedia.org/wiki/Han_unification https://en.wikipedia.org/wiki/Han_unification aimed to create a unified character set for the characters which are (approximately) identical between Chinese, Japanese, Korean and Vietnamese. It turns out this is complex and controversial enough that the wikipedia page is pretty gigantic.