A bell is a simple idiophone percussion instrument. Although bells come in many forms, most are made of metal cast in the shape of a hollow cup, whose sides form a resonator which vibrates in a single tone upon being struck. The strike may be made by a "clapper" or "uvula" suspended within the bell, by a separate mallet or hammer, or—in small bells—by a small loose sphere enclosed within the body of the bell.

Bells are usually made by casting metal, but small bells can also be made from ceramic or glass. Bells range in size from tiny dress accessories to church bells 5 metres tall, weighing many tons. Historically, bells were associated with religious rituals, and before mass communication were widely used to call communities together for both religious and secular events. Later, bells were made to commemorate important events or people and have been associated with the concepts of peace and freedom. The study of bells is called campanology.

Source: Bell from Wikipedia

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