A thread is a continuous strand (with fibres or filaments spun together) or combination of strands, made from any fibre or filament by reeling, spinning, twisting or throwing. A thread formed of a single strand is called a ‘single’ or an ‘end.’ A thread formed of two or more singles twisted together is a ‘plied thread.’ A 'plied thread' is often, and especially in UK English, called a yarn, but both terms are generally used synonymously.