Acoustic

Acoustics is a branch of physics focusing on the study of sound. Acoustic may refer to:

Music

Acoustic guitar, as opposed to electric guitar
Acoustic bass guitar, as opposed to electric bass guitar
Acoustic music, music that solely or primarily uses non-electrical instruments
Acoustic recording, a pre-microphone method of recording
Architectural acoustics, a branch of building design which aims for ideal sound projection
Musical acoustics, the branch of acoustics that studies the physics of music
Piano acoustics, the physical properties of the piano that affect its sound

Acoustic cryptanalysis, in cryptography, a side channel attack which exploits sounds
Acoustic fingerprint, a condensed digital summary, a fingerprint generated from an audio signal
Acoustic location, a pre-radar and pre-sonar method of detecting hostile vehicles and vessels
Acoustic metamaterials, engineered materials with atypical properties
Acoustic signature, sound emitters, such as those of ships and submarines
Acoustic thermometry, observation of ocean climate using long-range instruments
Acoustic torpedo, a torpedo that aims itself