Designated Throw in Spot violation Rule 7-62

[sfcjdb]

Rule 7-6-2 states that "The Thrower shall not leave the designated throw in spot until the ball has been released on a throw in pass." It also referances Rule 4-42-6, which says the same thing but adds that the pivot foot and traveling rule are not in effect. So the question is as a referee what signal is used, I could not find any referance to it in the book.