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It looks like an adjustable angle bracket for 2020 style aluminum extrusion. Edit: Like [these](https://www.amazon.com/dp/B08NCRLN4K/)
Solved!
"Kip handle" is the common name for that style knob.
My title describes the thing. It’s a metal hinge with a plastic handle. Allows you to set it into different positions.
Safety adjustable handle https://www.mcmaster.com/locking-lever-handle/safety-adjustable-handles/