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Old Tom
From Discworld & Pratchett Wiki
The huge silent bell that "rings" in the belfry at Unseen University. As it doesn't have a clapper, it doesn't peal, but being made of the magical octiron it is still heard, because noiselessness blooms from it, obliterating all other sounds, rendering conversation just as difficult as when one is stood under a particularly noisy carillon.
Picture of Old Tom by Matt Smith
Annotation
Roundworld reference: Great Tom is the bell that hangs in Tom Tower (designed by Christopher Wren) in Christ Church, University of Oxford, England. It is the loudest bell in Oxford, and measures seven feet one inch in diameter and five feet nine inches in height, and weighs six and a quarter tonnes.

