I came across this piece while sorting:
It appears to be similar to 2569, but it's clearly a different part. 2569 doesn't have the ridges and has a spherical tip rather than the cylindrical one on this part. The parts are roughly the same length.
I didn't see the word LEGO anywhere on the part, so I strongly suspect this is from a knockoff brand, but I wanted to make sure before I remove it.