Nexon Developer A: "Hey what's that thing that makes atom bombs go pow?"
Nexon Developer B: "uuuh idunno let's google it." *googles* "It says fission but I don't know which type."
Nexon Developer A: "Let's just call it Atomic Fission, no one will notice."
*queue 4 years later of people bitching about it in the forums*
Nexon Developer B: "Should we change it?"
Nexon Developer A: "Naaaah"