What does an umpire signal when play needs to be halted due to an infringement?

In netball, when play needs to be halted due to an infringement, the umpire utilizes a whistle as a standardized means of communication. Blowing the whistle serves multiple purposes: it is loud enough to capture the attention of players, officials, and spectators, and it clearly indicates that the game must stop. This method is essential for maintaining order during the match and ensuring that all participants recognize that the game has encountered a stoppage.

Relying on a whistle significantly reduces confusion compared to gestures or verbal commands, which may not be as universally understood or audible in a competitive environment. For example, while raising one arm high may signal certain actions or requests, it does not convey the same urgency or clarity as a whistle. Similarly, clapping hands loudly or shouting out a violation lacks the formal recognition that the whistle provides, making it less effective in ensuring that all players halt immediately.