Z twist

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

Origin of Z twist

First recorded in 1975–80

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

This sewing element, which serves as the weft, consists of 2-ply Z-twist cord with a medium-to-hard twist.
A Burial Cave in Baja California|William C. Massey
Cordage is of the 2-ply Z-twist type with each single S-twisted.
A Burial Cave in Baja California|William C. Massey
Single-ply S-twist warps crossed by single-ply S-twist and Z-twist wefts (1 fine-texture specimen).
Chincha Plain-weave cloths|Lila M. O'Neale
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

The cord on these specimens is invariably of the common 2-ply Z-twist agave fiber.
A Burial Cave in Baja California|William C. Massey