Kai Ou Ken (界王拳)= King Kai Fist (or Fist of King Kai). Kai is a fairly vague term that can mean boundary or "realm". In this case it's more akin to "realm". "World" is an acceptable translation.
Goku learned this from our friend, King Kai of the North(Kita no Kai Ou - 北の界王). The dub shortens this to simply King Kai. He is really only one of the 4 King Kais (or Kings of this Realm). The English dubs usually just calls them Kais.
See how much information is lost in translation?
I'm not against that in principal. And the only way people will get used to it is by actually using it.Originally Posted by DEX
To me Kilojoules is superior to Calories* because it is SI. No one uses it in daily conversations because it's uncommon. So you start by actually using it. I do it daily, then convert to calories only when people fail to understand it (thereby increasing their exposure to the SI term and its conversion).
*Not to mention when people say "calories", they're actually talking about kilocalories, because one calorie is actually tiny, which makes most conversations even more wrong.
Regarding Ultra Instinct, only gods seem to know about it. Perhaps then only beings with godly Ki can obtain that form. After all, The legend of Super Sayans was known amongst mortals even though the form had only been obtained a handful of times (once of twice IIRC, depending on whether Brolly counts).