Traditionally it is some kind of horn or air horn, maybe even a siren. The goal judge will turn on a red light similar to those on police cars, fire trucks, and ambulances and you will see the referee point towards the goal.
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After scoring a goal, the game is stopped and the ball us brought back to the center of the field. Once the referee has blown the whistle to continue playing the other team that did NOT score the goal can pass or dribble the ball. Play continues as it would before, but now the team that score the goal has one more point than the other team
The arena announcer will the name of the goal scorer, name of the player(s) credited with an assist for the goal and the time of the goal. If the goal was scored during a power play he (or she) will say if it were a power play or short-handed goal.