From the Pattern Introduction: a pattern of curving, undulating waves

Pattern repeat: This pattern is worked in a multiple of 12 chains plus 3.

Notes on gauge: As with all of the stitch patterns in this book, the gauge is flexible depending on your yarn and hook choice.  This stitch is popular for use in blankets.

Related Patterns: Pattern Number 9, Monochrome, is the same stitch pattern with different color striping.
Pattern Number 8 in the book, page 19.