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?
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1\$\begingroup\$ It's a connector. \$\endgroup\$– Andy akaDec 5, 2021 at 10:01
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\$\begingroup\$ I see, thanks a lot. \$\endgroup\$– RokeiaDec 5, 2021 at 10:07
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1 Answer
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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.
answered Dec 5, 2021 at 10:06