Information on yarn labels

Dear Community,
what information is typically found on yarn labels, and what is it used for?

Good morning,

In general, these are
- yardage per weight
- fiber composition
- recommended needle/hook size(s)
- manufacturer information
- “name” of the yarn
- gauge information
- washing/care recommendations 
You need this information, for example, to combine different yarns effectively. Of course, the intended use of the finished piece is also a key factor in choosing the right composition.
A gauge swatch is useful for anything that is supposed to end up a certain size.

Hmm… did I forget anything?

Best regards 

@Nina: At most, the color number—so you can buy the same color when you restock—and the lot number, which is important for avoiding any color variations within a single color.

But other than that, I can’t think of anything else ;-)

....
Some have a pattern for a project on the inside of the label,
especially yarn cakes or larger balls of yarn. 😊