As far as I know IEEE is not really a standard, it is a recommendation, while ANSI is a standard. ANSI is the American standard and ISO is International.

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Ori Idan CEO Helicon Books
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On Wed, Jun 26, 2024 at 8:56 PM segaloco via TUHS <tuhs@tuhs.org> wrote:
Good morning, I was wondering if anyone has the scoop on the rationale behind the selection of standards bodies for the publication of UNIX and UNIX-adjacent standards.  C was published via the ANSI route as X3.159, whereas POSIX was instead published by the IEEE route as 1003.1.  Was there every any consideration of C through IEEE or POSIX through ANSI instead?  Is there an appreciable difference suggested by the difference in publishers?  In any case, both saw subsequent adoption by ISO/IEC, so the track to an international standard seems to lead to the same organizations.

- Matt G.