That's a new one to me. It's not in any of my books, and I even did a complex google search, and found no patterns with that term.
Perhaps it means a row of straight knitting or purling? (ie. a "rest" from the pattern) ???
If we could see a picture of it, and the instructions, we may be able to figure it out for you. Or you could try contacting the designer.
KnittingHelp Queen Bee
"Don't ask yourself what the world needs. Ask yourself what makes you come alive and then go do that. Because what the world needs is people who have come alive." Howard Thurman