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My disappointment is immeasurable and my day is ruined
(lemmy.blahaj.zone)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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It means that it's Linux shaped as an arch.
Those are different, prefix "arch-" comes from greek "ἀρχι-", while noun "arch" is from latin "arcus".
Though, it should be mentioned that initially the meaning was taken from the prefix one, it's just with time everybody got used to the Arch arch logo and spelling, I suppose.