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. Tied in the bight, it can be made in a rope without access to either of the ends; this is a distinct advantage when working with long climbing ropes. The butterfly loop is an excellent mid-line rigging knot; it handles multi-directional loading well[2] and has a symmetrical shape that makes it easy to inspect.[2] In a climbing context it is also useful for traverse lines, some anchors, shortening rope slings, and for isolating damaged sections of rope.[3]

Quick facts: Butterfly loop, Names, Category, Related, Rel...
Butterfly loop
A butterfly loop with a carabiner.
NamesButterfly loop, alpine butterfly knot, butterfly knot, lineman's loop, Swiss loop, lineman's rider
CategoryLoop
RelatedAlpine butterfly bend, farmer's loop, artillery loop, span loop
ReleasingNon-jamming
Typical useFixed loop on the bight. Isolating a worn section of rope.
ABoK#331, #532,[1] #1053
Instructions
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