Sound
Sound or acoustic energy was a form of energy which propagates through matter and is received by a being or device capable of interpreting it. Its intensity can be measured in decibels, while the pitch of sound is measured in hertz. 

The sound of a transporter was loud and would alert guards before an assault team could be re-materialized. ()

In 2268, Doctor Leonard McCoy found that tribbles made a pleasant sound. ()

Sonic disruptors and hypersonic pulses used high-frequency sound to disable or kill a target. (; )

The Klingon glob fly was known for a loud buzzing sound. ()

See also 
 Music
 Noise
 Ultrasonic wave

External link 
 
Energy