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Re:Minoca OS: A new open source operating system by dom0 on Monday October 31, 2016 @07:31PM (#12841923)
> and X stands for Xtreme?

The X in POSIX is for unIX. Kinda like a pun on all the *nix things that were floating around back then (Xenix, Minix, AIX, Sinix, Ultrix, IRIX, ...)

Re:Minoca OS: A new open source operating system by atsaloli on Tuesday November 01, 2016 @01:48AM (#12843685)
See "The origin of the name POSIX" https://stallman.org/articles/posix.html