If you've ever seen a Jewish man with strings hanging out of his clothing, this is probably what you were seeing. There is no particular religious significance to the tallit (shawl) itself, other than the fact that it holds the tzitzit (fringes) on its corners.
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).
Sound Pressure Level : SPL is the RMS value of the Instantaneous Sound Pressures measured over a specified period of time, measured in decibels (dB). Sound Pressure : is the difference between the pressure produced by a sound wave and the barometric (ambient) pressure at the same point in space, symbol p or p.