In 2019 Nikon added a crop sensor line of mirrorless cameras that use the Z-mount. Crop sensor (APS-C) lenses are identified as DX.
The Z mount is a 16mm flange distance (mount to sensor) and 55 in inner diameter.
Nikon's brochure for Z-Nikkor Lenses
Nikon's video explaining benefits of the Z mount (Note that one of their claims in this video is false—that only the Z-mount allows f/0.95; that should be f/0.55 to be accurate.)
