A skein means yarn winded into an oblong bundle ready to use for knitting, crocheting, etc. It can also be used as a "unit of yarn".
What's In A Name – 11 Names For Yarn Balls And What They Mean
How to Wind a Ball of Yarn Into a Skein or Hank
What's the difference between a ball, a skein and a hank?
Hanks, balls, and skeins - oh my! - Stitches n Scraps
a ball of wool, SAVE 88%
My 3 Methods for Winding Yarn – Elizabeth Smith Knits
Does anyone re-skein their yarn after finishing a project? I have 40 & 50g of these yarns left, and no plan to use them in the near future. I've read that leaving
Huge Yarn bundle Some New Some Used Some Vintage - Supplies
Ball of Yarn, Skein of Yarn, Hank of Yarn, Cake of Yarn
My 3 Methods for Winding Yarn – Elizabeth Smith Knits