The common unit used to measure sound was named after Alexander Graham Bell? It is known as the decibel.
International standards bodies adopted the base-10 logarithm of the power ratio as a standard unit, named the bel in honor of the Bell System's founder and telecommunications pioneer Alexander Graham Bell. The bel was larger by a factor of ten than the transmission unit (TU), such that 1 TU equaled 1 decibel. For many measurements, the bel proved inconveniently large, giving way to the decibel becoming the common unit of choice.