What signal does a referee use to indicate that a goal has been disallowed?

When a goal has been disallowed, the referee raises their hand as a signal to communicate this decision. This action is universally recognized and helps ensure that players, coaches, and spectators are all aware of the referee's decision. Raising the hand serves as a clear indicator that the goal does not count, which is critical for maintaining the flow of the game and providing clarity on the outcome of the play.

The other options may involve gestures from the referee, but they do not accurately convey the specific message of a disallowed goal. Kneeling on the ground, for example, does not communicate any aspect of play. Continuous blowing of the whistle could indicate a variety of stoppages but lacks the specificity needed to signal the disallowance of a goal. Pointing to the corner flag typically signifies a corner kick, which is unrelated to the ruling of a goal.