History
The S numbers originated in England, where the worsted spinning process was invented and arose from the worsted yarn count system for stating the fineness of yarn. The worsted count was the number of 560-yard (510 m) lengths (hanks) of worsted yarn that 1 pound (0.45 kg) of wool yields. The finer the wool, the more yarn and the higher the count.
Read more about this topic: S Number (wool)
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