US military hardware does not use screw terminal blocks (at least what I have worked on).
At first I sorta thought it might be a jack; so J1.
I don’t really think of it as a “terminal”, it’s not the way I have seen “terminal” used in the field.
It would make sense that a terminal block, and a screw terminal block, would not share the same Ref Des. A terminal block typically connects two wire ends to the same terminal, while a screw terminal typically connects a single wire to a Pcb.
Yes, I have looked, Google is not helping me out at the moment. Anyone have some insight?