
1) Right-spun yarn term
Found on
https://www.crosswordclues.com/clue/z-twist

(from the article `twisting`) ...and rope production, process that binds fibres or yarns together in a continuous strand, accomplished in spinning or playing operations. The ... ...although too much twist may eventually cause weakening and breakage. When the spirals formed by twisted yarns are similar in slope to the central ... ...s...
Found on
http://www.britannica.com/eb/a-z/z/1

a direction of the twist in yarns, from top right to bottom left, resembling the long stroke of the letter Z. Cf.
Found on
https://www.infoplease.com/dictionary/z-twist
No exact match found.