The experimental hybrid exakernel written based on a fully new philosophy. It aims to ditch the standard POSIX API that is commonly followed by Linux, other hobby kernels and BSD. Therefore, Kasane is not in any way *NIX-compatible.
A exakernel is derived from 2 words:
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Exa: A SI prefix meaning one quintillion units.
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Kernel: The core component of an operating system that manages hardware resources and provides essential services for programs.
The idea is that the kernel contains a large amount of code, where reasonable, to be expandable, while keeping safety in mind at all times.
Might have just coined the term for the fun of it :3