Electronic – What does the wishbone symbol mean

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I'm looking at a schematic where various wires connect to blocks.
Sometimes the blocks have a wishbone symbol with a number next to it.
Other times, it's a wishbone symbol without a number.

I've been unable to find the correct name for this symbol to learn more about it.
What does it mean?

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Possibly unrelated, but why do the above blocks have dotted lines, while the one below does not?

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Best Answer

pin & socket interfaces are shown with

  • "> and >" or
  • "< and < " with interface showing type by intuition or
  • in this case socket and pin number
  • where J is for Jack , now unisexually called Receptacle meaning fixed connector because for other reasons and this Jack is "Female" or S=Socket
  • where P is for Plug, meaning moving connector.
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