Alicia Spinnet: "It's just so unfair. I mean, what about Crabbe and that Bludger he hit after the whistle had been blown? Has she banned him?"
Ginny Weasley: "No. He just got lines. I heard Montague laughing about it at dinner."
— Alicia complains about Harry, Fred and Georges' Quidditch ban.[src]

A Whistle is an instrument which produces sound from a stream of forced air. It is used by a Quidditch referee to signal the start of a game, fouls, time-outs and ends a game.

There existed a spell to turn a whistle into a pocket-watch.

In 1995, during the first meeting of Dumbledore's Army, Harry Potter had the members of the group practise the Disarming Charm. After a while, it came time for them to stop, but the level of noise was such that nobody could hear Harry shouting for them to stop. He thought to himself "I need a whistle" and the Room of Requirement provided, as he immediately spotted one lying on top of the nearest row of books, which he picked up and blew hard.[1]


Notes and references

  1. Harry Potter and the Order of the Phoenix, Chapter 18 (Dumbledore's Army)