To classify a thread many characteristics, such as strands or ropes, weight, length, etc. are used. So as combine this has resulted in the creation of various numbering systems. They follow different metric systems, business customs etc. It is important to know because we'll find printed on the labels of the balls we buy.
Fixed weight numbering systems:
Weight is a fixed unit and length is measured.
In these fixed weight systems we must be aware that the thread gets thinner the more rises the Ne or Nm.
Fixed length numbering systems:
The length is fixed and the unit weight is measured.
In these systems fixed length have to be aware that the yarn is thicker and heavier the more rises the Denier, Tex or Decitex.
Ticket numbering systems
The ticket number or bill is a commercial numbering system, it is the manufacturer part numbers for a given thread size. Numbers Ticket are similar to the system of fixed weight, so we must consider that in this higher system is the ticket number, the thinner is the thread, and the lower the ticket number, the heavier or thicker the thread.
Tows or strands
The amount of tows or strands having a yarn is specified as follows:
Table of equivalent of yarn numbering systems