They are called jimping. I have no idea if I spelled that right.
I much prefer a fixed blade. My daily carry is a folder lock-blade but that is just for convenience. When I am out and about in the woods I always wear a fixed blade. The first one is my favorite hunting knife. The second one I am getting made for my son for his B-day (and me one too :coffeedrink: ) It should serve him well for a long time.