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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 ==Other uses==