Type of knot:
Friction hitch

To suspend a climber on their rope within a double rope system, or a single rope system (if accompanied by extra hard wear such as Rope Wrench or Hitch hiker) and allows the climber to ascend and descend by moving the hitch in the desired direction.
Can be tied to a rope to create an attachment point for a pulley when setting up a 3-1 pulling advantage.

Additional info:
This knot can be accompanied with a micro pulley to tend the slack as the tail of the rope is pulled through.

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