There are two meanings for 'ply' with wool. Some wool manufacturers use the term ply to describe the weight of the wool. A 2 ply is a very fine baby wool whereas a 16 ply is a chunky or heavy weight yarn. The other meaning is the number of threads the yarn consists of. For example to a hand spinner a 2 ply means a yarn that has two single threads 'plied' together to form one length of yarn.
The stuffing of a baseball is cotton yarn, 3-ply grey wool yarn,4-ply grey wool yarn, a pill, 3-ply white wool yarn,black rubber, and red rubber.
Your question doesn't make sense. For example: 4-ply yarn is 4 singles plied (twisted and set) together.Lace weight yarn is usually single or 2-ply.
Most 4-ply yarns are medium-weight, which may carry the name worsted weight yarn. Ply is a complicated thing. Thickness and ply of yarn is different depending on where the yarn is manufactured. In the U.S. worsted weight is generally 4 ply. The number of plies is not always an indication of weight, however. It is just tells you how many strands are used in that type of yarn.
Yarn that is a single strand is called single-ply or one-ply.
Yes, DK weight (also called double knitting) is 8 ply yarn
Patons Ritz yarn was a bulky yarn. It was about 12 ply.http://www.ravelry.com/yarns/library/patons-ritz
sometimes called 2 ply it is thin yarn which produces a thin fabric and is used for knitting lace (among other things)
In the UK, worsted weight yarn corresponds to 10ply (i.e. heavy DK or light aran yarn)
I'll assume your question is: What WEIGHT is Unger Madelaine yarn? Answer: Bulky/12 ply.
The number of plies is independent of the weight or fiber content of the yarn. It is possible to have a single ply super bulky like Brown Sheep's Burly Spun, or something like the 8 ply fingering weight on my sock needles right now. If you want to know the plies in a specific yarn, we'd need to know the brand name and yarn name.
two for one, 2 ply (ends) of yarns are twisted to form one.
This does not seem to be a current yarn. I suggest you contact Paton's via their website.