knot used to join two lines.

zeppelin bend (Wikipedia)

A zeppelin bend (also known as the Rosendahl Bend) is an end-to-end joining knot formed by two symmetrically interlinked overhand knots. It is stable, secure, and highly resistant to jamming. It is also resistant to the effects of slack shaking and cyclic loading.

Zeppelin bend
NamesZeppelin bend, Rosendahl bend, Rosendahl's knot
RelatedZeppelin loop, Hunter's bend, Ashley's bend, Alpine butterfly bend
Typical useJoining two ropes of similar size
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