Nikon NIKKOR Z 24-120mm f/4 S Reference Manual page 11

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Lens hood
Lens hoods block stray light that would otherwise cause flare or ghosting.
They also serve to protect the lens.
"Attaching and Removing the Lens Hood" (p.16)
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Lens hood lock mark
Use when attaching the lens hood.
"Attaching and Removing the Lens Hood" (p.16)
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Lens hood alignment mark
Use when attaching the lens hood.
"Attaching and Removing the Lens Hood" (p.16)
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Parts of the Lens: Names and Functions