S twist

noun

a direction of the twist in yarns, from top left to bottom right, resembling the long stroke of the letter S.

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Compare Z twist.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for s twist

The spirals formed by twisting may extend upward to the left (the S-twist) or to the right (the Z-twist).
Chincha Plain-weave cloths|Lila M. O'Neale