8 ply yarn refers to the thickness of the yarn, indicating that it is made by twisting together 8 individual strands
. In the UK and Australia, 8 ply yarn is commonly used, and it corresponds to what is called 'dk' weight in the US
. The ply of the yarn affects its thickness, but it does not necessarily correspond with yarn weight or thickness. For example, 4-ply yarn is thinner than 8-ply yarn, which is thinner than 10-ply yarn
