Power input connector for power distribution board
I know that sort of connection as a &quot;terminal post&quot;.  Many are designed to accept 4mm banana plugs, but not those.  Many have a hole though the screw thread to push a wire through as well.
The threaded rod normally continues through the insulated base, so a ring terminal and locking nut can be used to make connection to the other end.  My guess is that it would be connected to the circuit board by a short lead.