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We could call it, I don't know, "Protected Mode"?

It'll never catch on.

Hear me out here: Maybe if we split the address space into various use-specific segments...

Call it Ring 0, 1, 2... for good measure

Is this a good moment to relitigate the Tanenbaum-Torvalds debate?

Let's start with 0 because there won't be anything less than 0. Same when using letters, start with A because things will never get better than A