‘Spinning’ refers to the twisting or coiling of long flexible tension members (fibres/yarn/rope) into tensioned helix structures – coils.
“As the fibres wrap round each other, they press inwards and grip each other. With sufficient twist, there is a self-locking structure: the greater the tension, the tighter the fibres are gripped. By the various methods of hand-spinning, natural fibres were converted into yarns.”
McKenna, Hearle and O’Hear (2004), Handbook of fibre rope technology