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Literally nobody knows this though. Even searching for "Horizon OS" only returns Meta stuff already.

Yeah - while I've never dived too deeply, I have modded my 3DS a fair bit and didn't know what the OS was codenamed. I've always just seen it called 3DS OS, native firm, etc.

And also for people following the UK news, the name of the Fujitsu/Post Office software that led to a not insignificant number of sub-postmasters being falsely convited in the largest miscarriages of British justice ever (maybe anywhere).

https://en.wikipedia.org/wiki/British_Post_Office_scandal

There's precedent, when Apple named iOS, Cisco had (and still has) IOS. They just came to some licensing settlement for Apple's use of the name [0].

Actually, it looks like Apple also licensed the iPhone trademark from Cisco too!

[0] https://en.wikipedia.org/wiki/IOS#:~:text=In%20June%202010%2....

Eh, I don't think this is a bad name collision. Nintendo doesn't really talk about stuff like this publicly, and searching for it is pretty much reddit + hacker news threads.

I'm sure there's a lot of internal code name collisions.