Nikon NIKKOR Z 24-120mm f/4 S Reference Manual page 9

7
Lens mounting mark
Use when mounting the lens on the camera.
"Attachment and Removal" (p.13)
8
Rubber lens-mount gasket
Helps prevent the ingress of water droplets or dust along the surfaces
where the lens and camera meet when the lens is mounted on the
*
camera.
* There is no guarantee that the gasket is completely proof against the
ingress of water droplets or dust in all circumstances.
9
CPU contacts
Used to transfer data to and from the camera.
7 8 9
9
Parts of the Lens: Names and Functions