Photo of Decible Meter courtesy of FreeImagesLive.co.uk
The decibel (symbol dB, one-tenth of a bel) is a unit used in electrical engineering and acoustics to express relative loudness. What I didn't know is that the bel was named after Alexander Graham Bell(1847-1922).
For more information, in addition to the links above see the website of The Alexander Graham Bell Family Papers at the Library of Congress.
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