Rod end bearing.....
Or
It's a "pillow ball rose joint".
Or, because it's a big world...
A rod end bearing, also known as a heim joint (N. America) or rose joint (U.K. and elsewhere), is a mechanical articulating joint.
https://en.wikipedia.org/wiki/Rod_end_bearing
Or, squeaky noisy joints that wear out pretty quick if you dont look after them.