Huh, that might be fun to make a giant, novelty "ON" button to put on my desk. I guess I never really thought about it, but the power button really just bridges the two power pins, right? Pretty obvious but never gave it a thought. You can probably guess I don't do much work with electronics.
Yep, it's a 'momentary push-to-make' if you want a couple of search terms.
i.e. after press it returns to its previous state (momentary), and on press it 'makes' (as opposed to 'breaks') the circuit, or 'bridge' between pins as you said.
Which is why my screwdriver works - I momentarily hold it across the pins, making a connection between them.
