The WiFi Signal cowl is knitted in the round in two-colour brioche. The stitch pattern was first inspired by traditional japanese Seigaiha pattern (青海波), but when I looked at the finished piece it really reminded me of the symbol for WiFi Signals.
This cowl is long enough to fit twice around your neck.

This pattern PDF is 9 pages long and contains

• row-by-row pattern instructions
• a charts of one pattern repeat
• photo tutorials for the following brioche stitches: brk2inc and brk2Rdec

So to knit this cowl you should have a basic knowledge of knitting two-colour brioche.

For the piece in the photos I used the following yarns:

• as DY (dark turquois to black): Schoppel Zauberball 2038 Cafe Flair
• as LY (light beige): Vendita Sock yarn