SNR

n. difference in decibels between a signal emitted from a device and the noise emitted from the same device

The initialism SNR may refer to:Signal-to-noise ratioSupernova remnantSporting News RadioService National de Renseignements, secret service in BurundiSociété Nouvelle de Roulements:Spiritual Not Religious International industrial group and French bearing manufacturing leader.
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SNR may refer toSupernova Remnant, the relic of a stellar explosion.Signal-to-Noise Ratio 
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n. Signal to Noise Ratio, difference in decibels between the signal emitted from a sound device and the noise emitted from the same sound device

Abbreviation for signal-to-noise ratio.

The ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in time. [JP1] Note 1: SNR is expressed as 20 times the logarithm of the amplitude ratio, or 10 times the logarithm of the power ratio. Note 2: SNR is usually expressed in dB and in terms of peak values for impulse noise and root-mean-square values for random noise. In defining or specifying the SNR, both the signal and noise should be characterized, e.g., peak-signal-to-peak-noise ratio, in order to avoid ambiguity.

signal-to-noise ratio