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NOISE - [ACOUSTICS] Sound which is unwanted, either because of its effect on humans, its effect on fatigue or malfunction of physical equipment, or its interference with the perception or detection of other sounds.

McGraw Hill "Access Science" online dictionary www.accessscience.com

NRC - The Noise Reduction Coefficient of an acoustical material is the arithmetic average of the nearest multiple of 0.05 of its absorption coefficients at 4 one-third octave bands with center frequencies of 250, 500, 1000, 2000 Hertz.

STC - Sound Transmission Class - The preferred single class rating system designed to give the sound insulation properties of a structure for the rank ordering of a series off structures.

Useful links:
OSHA - Occupational Safety Health Administration http://www.osha.gov
ASTM - American Society for Testing and Materials http://www.astm.org
INCE-USA - Institute of Noise Control Engineering of the USA http://www.inceusa.org
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