A bell is a simple sound-making device. The bell is a percussion instrument and an idiophone. Its form is usually a hollow, cup-shaped object, which resonates upon being struck. The striking implement can be a tongue suspended within the bell, known as a clapper, a small, free sphere enclosed within the body of the bell or a separate mallet or hammer.
Electric bells (such as often found in schools, some fire alarm systems, etc.) are electrically rung by an electromagnet that makes a metal hammer vibrate, striking the bell.
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