The Twizzled loop is used in ledger and feeder fishing rigs to create a stiff section of line.
Twizzled sections are used in a rig to reduce tangles on the cast.
By doubling the line and twisting it together, a stiff boom can be created to keep the hook link and mainline apart in the air and through the water.

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Coarse Fishing Knots: https://coarsefishingknots.co.uk/