I suspect it might be related to a train coupler but I could be totally wrong. I couldn't find it in the train parts category on Bricklink. It seems similar to part 2920.
It has an open stud on the top and an antistud on the bottom, and a regular axle hole going across. The clip things that are on one side are smaller than the diameter of a regular bar.
It says "(C) Lego Group" and "3" and "01" but I do not see a part number.