You can clearly see that the large end was beaten. That excludes a scissor type device. A balance beam would be "balanced" length wise about the pivot point. Even if it was a type of ratio balance beam, taking advantage of the length differences, it'd be longer in general. If the ground I was camping on needed a tent stake like that, I'd find softer ground. I hate sleeping on a concrete slab.
It's some kind of attachment for rock. I've seen one similar driven into a large rock in the middle of a creek. The site of an 1800's ford. I'm sure many of us have seen similar types of anchors in canal walls, stone bridge abutments etc.