The referee will bring both arms close into his chest as if he's holding an imaginary ball. This is to show the ball has not been released when the player in possession was tackled and didn't release ...

The referee will raise one hand above his head with his shoulders in line with touch. He will then move that arm backwards and forwards to show the ball was not thrown straight by the hooker.

During a competitive game of rugby, there is a referee and two ... but acts as an additional referee and signals if they observe an infringement to the laws.