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I'd like to ask about this "empty set" like symbol with a diagonal line through a circle, as shown in the picture below. I have found it in an old electrical schematic. What is it exactly?

Scan of schematic

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    \$\begingroup\$ It's a connector. \$\endgroup\$
    – Andy aka
    Commented Dec 5, 2021 at 10:01
  • \$\begingroup\$ I see, thanks a lot. \$\endgroup\$
    – Rokeia
    Commented Dec 5, 2021 at 10:07

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Those are terminals. Usually they indicate where external devices are connected to a board or panel and also for inter-connections between boards or panels.

In this case I would expect that devices 17 and 2 are wired to terminals (screw or solder-post) on the main assembly.

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