noun
twist; ply
Refers to the twist given to yarn, thread, or rope; also the number of strands twisted together (ply). Common in textile and craft contexts.
この糸は撚りが強いので、丈夫です。
This thread has a tight twist, so it's strong.
三つ撚りのロープを買った。
I bought a three-ply rope.
Verb form meaning 'to twist' or 'to ply'; 撚り is the noun derived from it.
Noun form of the verb 撚る (よる, 'to twist'). The kanji 撚 specifically relates to twisting fibers.