nr

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NR

(materials)

noise reduction, NR

The difference in decibels between the average sound pressure levels produced in two rooms by a sound source in one of them.

nr

(networking)
The country code for Nauru.
References in classic literature ?
He spoke tauntingly, but there was no response, then he prodded the fallen man with the point of his spear.
Bradley made no response, and in silence they continued until the outer edge of roofs was visible before them.
They listened, rapped on the scaly burnt metal with a stick, and, meeting with no response, they both concluded the man or men inside must be insensible or dead.