The overhand knot is the Thumb knot with thread, Half knot if a binding, Half hitch when a hitch, Strangle snare when tied around it's own rope, or Trefoil knot when a mathematician's knot. This is the left handed one.
If tightened, it's almost impossible to untie, and weakens the cordage by 50%. So what ever you do, DON'T TIGHTEN IT!
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Step 1: Straighten Rope
Step 2: Loop Rope
Step 3: Put Rope Through Loop and DONE!
Don't tighten unless you want your rope to be 50% less strong!