I frequently call out waste yarn in my patterns. This is just a substitute for a stitch holder. Personally, I don't use stitch holders.
Placing Stitches on Hold
Knit with Henni
The Independent Stitch: Knitting
tutorial
Stitch Markers, GSR Markers, and Pin Markers - Jill Wolcott Knits
Ischia Scarves - Jill Wolcott Knits
Ravelry: Mediterranean Scrub Set pattern by Jill Wolcott
Using Scrap Yarn Instead of Stitch Holders - PurlsAndPixels
ELIZABETH KAY BOOTH – Designing with yarn to make life beautiful
Ischia Scarves - Jill Wolcott Knits
Ischia Scarves - Jill Wolcott Knits
Inverleith KAL - Dividing the Front and Back - Ysolda
Waste Yarn, What Yarn? - Mary Jane Mucklestone
kathleen dames: November 2015
Jupiter's Rings LGF - Jill Wolcott Knits