Butterfly loop
Knot
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The butterfly loop, also known as lineman's loop, butterfly knot, alpine butterfly knot, Swiss loop and lineman's rider, is a knot used to form a fixed loop in the middle of a rope. Wikipedia
ABoK: #331, #532, #1053
Category: Loop
Names: Butterfly loop, alpine butterfly knot, butterfly knot, lineman's loop, Swiss loop, lineman's rider
Typical use: Fixed loop on the bight. Isolating a worn section of rope