What does the key symbol next to the C3 button on the A7R IV stand for?

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VisionLight
VisionLight Veteran Member • Posts: 5,302
What does the key symbol next to the C3 button on the A7R IV stand for?

I don't find the answer in any search or in the manual. The symbol is next to the C3 button on the top left of the back of the camera and looks like an old style lock key (O-n).

TIA

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