I'm gonna have to give another point to swaybar link. It's attached to one end of a swaybar, I can tell that much. I really can't think of a better name for it. Looks cheap though. Take it to a mechanic unless you have a good parts site. BTW, the design is horrible. That itty-biddy rod holds the entire sway bar on your car. Way to go Nissan!
and no thats not the only thing holding the sway bar on there are 4 brackets that hold it in place 2 of them are bolted to the frame these come down from the ends of the sway bar to the LCAs to help improve handling
You could just junk it. The only difference it will make is that the car will handle like a boat (more than it does). I'm not sure how familiar with cars you are, but all a swaybar does is counteract the "boat-like lean" that really heavy cars have. A vehicle can be driven without one; it just puts a LITTLE more stress onto the other parts of the suspension.