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
It is not because things are so difficult that we do not dare; it is because we do not dare that they are difficult.