The indicators of twisting properties include twist indicating the degree of twisting, twist coefficient, and twist direction indicating the direction of twisting.

Twist yarn twists back by twisting one turn at the twisting angle. The number of twists per unit length of yarn is called twist. China's cotton yarn adopts a special number system twist, which is expressed as the number of twists within a 10cm yarn length; Combed wool yarn and synthetic filament are twisted using the metric count system, which is expressed as the number of twists per meter; In addition, there is also the British count system twist expressed in twists per inch.

Twist coefficient cannot be used to compare the twisting degree of yarns of different thicknesses, because for the same twist, the fiber inclination of thicker yarns is greater than that of thinner yarns. In actual production, the twist coefficient is commonly used to indicate the degree of twisting of yarn. Twist factor is a relative numerical value that combines linear density to represent the degree of twisting of yarns, and can be used to compare the degree of twisting of yarns of different thicknesses. The twist coefficient can be calculated based on the twist and linear density of the yarn.

Twisting direction refers to the tilted direction of fibers or strands in a single yarn after twisting. It is divided into two types: Z-twist and S-twist. After twisting, the twisting direction of the yarn tends from the lower right corner to the upper left corner, and the tilting direction is consistent with the middle of the "S", which is called S twisting or casual twisting; The twisting direction of the yarn tends from the lower left corner to the upper right corner, and the tilting direction is consistent with the middle of the "Z", which is called Z-twist or backhand twist. Generally, single yarn is twisted with Z, while stranded yarn is twisted with S.

The twisting direction of the strands is represented by the twisting direction in the order of twisting. For example, the twisting direction of a single yarn with Z-twist, initial twist with S-twist, and compound twist with Z-twist is represented by ZSZ.