wraps per inch. it's a good way to figure out what weight you've just spun if you're into spinning.
"You can start going to the tanning bed now so you'll look all spiffy in your dress." - my brother
"Beautiful yarn speaks to the soul of a knitter." - Shandeh
"The Swatch is good. The Swatch is wise. Listen to the Swatch." - Sandi Wiseheart