Noct is
Nikon
(, ; ) is a Japanese optics and photographic equipment manufacturer. Nikon's products include cameras, camera lenses, binoculars, microscopes, ophthalmic lenses, measurement instruments, rifle scopes, spotting scopes, and equipment related to S ...
's trademark for its largest-aperture camera lenses: the Noct-Nikkor 58mm f/1.2 lens produced from 1977 to 1997 and the
Z mount 58mm f/0.95 S Noct introduced in 2018.
References
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Nikon lenses